Deep verification of 3 PDF files for authenticity

Budget: 25 EUR Deadline: 2 days

Good day! I analyze PDFs at the structural level, not just visually: I look at metadata (CreationDate/ModDate, Producer), the history of edits through incremental updates in xref, which fonts and images are embedded, and whether the document has been reassembled or converted. This really shows whether the file has been tampered with after creation. For each of the three documents, I will provide a written conclusion with the identified signs and the limits of the check. Were the files originally created as PDFs, or are they scans/photos of documents? This affects what can be extracted at all.

Budget: 25 EUR Deadline: 2 days

Hello, Michael! This is exactly the type of verification I am engaged in — technical analysis of PDFs for authenticity, rather than visual inspection.

What I specifically do for each of the three files:
— metadata: dictionary /Info + XMP, checking CreationDate vs ModDate (a typical marker of editing or backdating);
— structure: analysis of objects, xref tables, and EOF markers — several incremental saves almost always indicate that the file has been rewritten;
— history and software: which Producer/Creator generated it and whether there were conversions/re-saves;
— embedded fonts, images, layers (OCG) — and discrepancies between them and the rest of the document;
— separately noting signs of backdating and technical anomalies.

Tools: pikepdf/qpdf, pdfid and pdf-parser, exiftool, mutool — low-level analysis, not a "black box" parser.

The output will be a written conclusion for each file: what was found, the level of risk, and where the verification has limitations (honestly, without "100% forgery" where the data does not support it).

One clarification: is the conclusion needed as a technical report, or in a form suitable for legal/official use? This will determine how formally it should be presented.

I am ready to run one file immediately as a quick preliminary analysis so you can see the format of the conclusion before making a decision. The deadline for all three is 2 days.

Petro Pankov, BotCraft Group Expand

Budget: 25 EUR Deadline: 7 days

Hello! I have practical experience in digital forensics and technical analysis of files for authenticity. I will conduct a thorough low-level audit of your three PDF documents to identify hidden edits, metadata manipulation, or "backdating." For detailed analysis of the PDF structure, I use a comprehensive approach and specialized tools: Metadata and XML structure analysis: Using ExifTool and pdfid, I will check the CreationDate, ModDate, Producer, and Creator fields. I will compare XMP metadata with system tags to detect temporal anomalies (for example, when the modification date precedes the creation date or only the displayed text has been changed). Low-level audit of objects (PDF Structure): Using pdf-parser and Didier Stevens Tools, I will break down the file into individual objects, streams, and Cross-Reference Tables (XREF). This will allow me to see hidden layers, deleted text blocks, the history of incremental saves, and residual data from previous versions. Font and image analysis: I will check embedded fonts for consistency and compliance with the software that created the file. Using ELA (Error Level Analysis) and color profile checks (if the PDF contains scans/images), I will detect local photo montages or additions of elements. Report generation: Based on the results, I will provide a clear technical conclusion (PDF/Docx) for each file: identified artifacts, used software (for example, traces of Adobe Acrobat, Nitro, Foxit, or online editors), risk assessment of forgery, and limitations of the expertise. I guarantee complete confidentiality of your documents during the review. Message me privately; I am ready to review the files and start working!

Budget: 25 EUR Deadline: 1 day

I will conduct a technical review of all three PDFs and prepare a separate clear summary for each file. I will check the metadata, object structure and xref, embedded fonts and images, signs of resaving, editors, and temporal inconsistencies. Then I will compare the findings between the files, noting the level of confidence and limitations, so that the summary does not present assumptions as proven facts. After reserving the funds, I will deliver the report in PDF and the feature table within 12 hours. Do you still have the original files in the exact form they were received, without being sent through messengers?

Budget: 25 EUR Deadline: 1 day

Hello! I fully understand the task. A deep technical audit of PDF files is needed to check for editing, date forgery, and structural manipulation.
I will be honest about my profile: I just registered on the platform, as I previously developed all automation exclusively for my own business needs. Now I am entering the marketplace and actively building my reputation, so I approach each project with maximum responsibility.
Here’s how I will check the files:
Metadata analysis: I will compare creation and modification dates (CreationDate vs ModDate), as well as check information about the original software (Producer, Creator).
Structure and history: I will check the file for incremental saves and cross-reference tables (xref) to see if the document has been reassembled.
Low-level analysis: I will analyze embedded fonts, layers, and objects for hidden signs of editing.
Result: I will prepare a detailed written report for each file with identified signs of interference.
Conditions:
Deadline: 1 day.
Cost: 25 EUR.
I am ready to start, waiting for the files for review! Expand

Budget: 25 EUR Deadline: 1 day

Hello!

I am ready to conduct a thorough technical audit of your three PDF documents for manipulations, editing, and date changes. In my analysis, I use digital forensics methods, not just a visual inspection.

My verification methodology will include the following stages:
1. Metadata analysis: extraction and comparison of creation/modification dates (CreationDate, ModDate), information about the original software (Producer, Creator), and the operating system.
2. File structure analysis (PDF Structure): checking for incremental saves (when the document is visually altered, but an old version is saved inside the file in previous cross-reference tables).
3. Content and object analysis: checking the compression structure of embedded images, inconsistencies in font subsets, hidden text layers, and deleted objects.
4. Graphic manipulation analysis: checking embedded images for compression in graphic editors.

For each file, I will provide a detailed report describing the structure, identified anomalies (if any), and a final conclusion about the document's reliability.

I am ready to complete the work within one day. I look forward to collaborating! Expand

Budget: 50 EUR Deadline: 1 day

I will do everything quickly and efficiently, within a short timeframe, I am waiting for your response and hope for an answer.

Budget: 25 EUR Deadline: 1 day

Hello, Mykhailo! I am ready to conduct a deep analysis of 3 files. I will check the metadata, object structure, and incremental updates using Python (pdf-parser/exiftool). For each file, I will provide a clear report with a verdict: original or edited. I will do it for 1000 UAH in 1 day via Safe. Please send the files, and I will start immediately.

Budget: 25 EUR Deadline: 2 days

Hello. I will perform a technical analysis of 3 PDFs: metadata, structure, fonts/images, editing signs, conclusion for each file. Tools: pdf-parser/qpdf/Python. Please send the files after selection. The price is starting and negotiable.

Budget: 25 EUR Deadline: 1 day

Good day, I am ready to help you, I have 5 years of experience in automation with Python, I will be happy to assist you, write to me and we will communicate.

Budget: 40 EUR Deadline: 2 days

Ready to perform a technical check of three PDFs — not a visual review, but a structural analysis of the files.

What I specifically do for each file:
• Extract metadata (CreationDate, ModDate, Producer, Author) and verify it against the stated creation date
• Check incremental updates and edit history through the xref table
• Analyze modification strings and what fonts are used
• Review pages and objects at the dictionary level, not just in visual representation
• Optionally: file hashes for integrity control

The result — a report for each document: whether there are signs of editing after the initial creation, whether the dates match, and whether there are inserted/replaced pages. Each conclusion — with confirmation from the raw data of the file.

This is not a scorpion "look and tell." I have laid out the competitors' arguments in a few lines, but I understand the subject more deeply. The technical expertise must be sufficient to be presented as evidence — without assumptions. I will work exactly this way.

Write to me — and I will send a report template so you can see the format before we start. Expand

Budget: 25 EUR Deadline: 1 day

Hello! You missed the categories a bit (SQL has nothing to do with this), but the task itself is completely clear. I have experience working with low-level file structures and metadata analysis.
Here’s how I will conduct a thorough check of your 3 files:
1. Metadata analysis: I will use ExifTool to read the full file history, the actual creation/modification dates, and the software in which it was saved. I will check if the date has been altered retroactively.
2. Structural analysis (PDF forensics): I will use the tools pdfid and pdf-parser to analyze the object tree. This will help find hidden layers, incremental updates (when the visual text is one thing, but the structure retains the old original), and external embedded scripts.
3. Fonts and graphics: I will check the compliance of embedded fonts and the artifacts of image compression that appear when re-saving in editors.
Based on the results, I will prepare a clear written report for each document with a verdict and risk assessment.
For a budget of 25 EUR, I can do everything in 1 day via Safe. Please send the files in private messages; I am available!

Budget: 150 EUR Deadline: 4 days

Hello!

Checking the authenticity of a PDF requires not just a visual inspection, but an analysis of the internal structure of the file — this is what I regularly work with.

In projects involving migration and integration of document flow, I have had to analyze the structure of PDFs, XMP metadata, and embedded objects to identify discrepancies after conversion or re-saving.

I structure the verification as follows: analysis of metadata and XMP history, examination of the cross-reference table and objects for re-recording, checking embedded fonts and images for compliance with the declared software, and searching for traces of layer editing or overlaid elements.

For each file, I will provide a written conclusion listing the identified features, risk level, and clear limitations of the verification method.

Could you clarify the origin of the files (scans, export from the system) — this will help to more accurately assess the scope of the verification? Expand

Budget: 25 EUR Deadline: 1 day

I have practical experience in digital document forensics. To search for manipulations, I do not limit myself to basic metadata but analyze the PDF structure at a low level (qpdf, peepdf, hex-analysis): I look for anomalies in xref tables, traces of incremental updates, orphaned objects after editing, and discrepancies in XMP dictionaries. Based on the results, I will provide a clear, technically substantiated conclusion for each of the three files: whether there was interference, what exactly it was, and what traces remain. I am ready to take on the work.

Budget: 25 EUR Deadline: 2 days

Good day! I can perform a technical analysis of three PDF files at the level of internal structure, not just visual review.

I will check:
— metadata /Info and XMP, creation and modification dates, Creator/Producer;
— PDF structure, objects, xref tables, %%EOF, and possible incremental updates;
— signs of re-saving, conversion, or reassembly of the document;
— embedded fonts, images, layers, and their technical inconsistencies;
— software used to create or edit the files;
— possible anomalies that may indicate tampering.

For the analysis, I will use ExifTool, qpdf/pikepdf, pdfinfo, mutool, and low-level file structure analysis.

Based on the results, I will prepare a separate clear conclusion for each PDF: identified signs, possible explanations, risk level, and limitations of the analysis. I will not make unfounded claims of "100% forgery" unless the technical data supports it.

Before starting, I ask to clarify whether these are scanned documents or PDFs created directly by software, as well as whether a regular technical report or a document for official/legal use is needed. Expand

Budget: 25 EUR Deadline: 4 days

Hello! I am ready to perform a deep digital expertise of your PDF documents for forgery, backdating, and hidden editing. I have practical experience in Digital Forensics and detailed analysis of the internal structure of binary files.

A visual review is only 5% of the check. The main evidence of manipulation is always hidden within the logical structure of the document.

Budget: 50 EUR Deadline: 3 days

visual review. I will examine the document metadata, internal PDF object structure, creation and modification history, embedded fonts and images, producer/creator information, cross-reference tables, object streams, incremental updates, and other indicators that may reveal editing, conversion, or possible manipulation. I will also document any inconsistencies, explain the limitations of the analysis, and provide a clear written report for each file.

One important point is that not every edited PDF leaves reliable forensic traces, so the conclusion should be based on technical evidence rather than assumptions. I'll clearly distinguish confirmed findings from indicators that are only suggestive.

I have experience analyzing file metadata and document structures using forensic and PDF inspection tools, including ExifTool, PDF parsers, qpdf, pdfcpu, and low-level object inspection techniques to identify potential modifications and inconsistencies.

If you can share the files, I can begin the analysis immediately and provide a detailed report with the findings for each document.

Budget: 25 EUR Deadline: 2 days

Hello! I have experience in parsing and technical analysis of PDF documents at the object structure level. For authenticity verification, I use a comprehensive approach: metadata analysis (XMP, Document Info), cross-reference tables structure verification, change history analysis (incremental updates), and checking embedded objects for discrepancies in timestamps or the software that created the file. I can use both specialized Python scripts and professional forensic analysis tools (such as exiftool, pdfid, pdf-parser) for the work. I am ready to provide a detailed report for each file with conclusions regarding the integrity of the structure. I am open to discussing the details, feel free to write!

Budget: 26 EUR Deadline: 1 day

Hello!

I am ready to conduct a comprehensive technical analysis of the provided PDF documents.

I have experience working with the analysis of electronic file structures, metadata, and digital forensics. In my review, I use a comprehensive approach that allows me to identify not only obvious but also hidden signs of editing, re-saving, conversion, or other changes to the document.

During the analysis, I will check:

* metadata and XMP information;
* internal structure of the PDF and document objects;
* creation history and possible changes;
* software used (Creator, Producer, etc.);
* embedded fonts, images, layers, and other elements;
* signs of re-saving, incremental updates, conversion, or other technical changes;
* possible discrepancies that may indicate manipulation of the document.

Based on the results, I will prepare a detailed written report for each PDF file, describing the conducted review, identified technical features, discovered risks, and limitations of the analysis. The report will be presented in clear language and suitable for use in further work with lawyers or other specialists.

I am ready to start the review immediately after receiving the files and will promptly provide the results. Expand

Budget: 25 EUR Deadline: 1 day

Hello! I am ready to help with your project. I have extensive experience in development and can implement all the necessary components according to your documentation. I guarantee quality execution within the agreed deadlines.

Budget: 25 EUR Deadline: 1 day

Hello. To conduct a thorough technical verification of PDF files for authenticity, I employ a comprehensive approach that includes low-level analysis of the internal structure of the document, metadata, incremental updates, and object streams, using both specialized forensic tools and my own automated scripts developed during similar projects for verifying the authenticity of digital documents. This allows for the effective detection of hidden signs of editing, re-saving, or manipulations at the object and attribute levels. My expertise ensures the formation of a detailed conclusion with a clear description of all identified discrepancies and risks. I suggest discussing all implementation details, final budget, and timelines in private messages.

Budget: 25 EUR Deadline: 1 day

Hello!!!! I am ready to check the documents thoroughly and provide the appropriate report in the shortest time possible!!!

Budget: 75 EUR Deadline: 1 day

Hello! I am ready to perform a deep technical analysis of three PDF files.

Methods and tools I will use for the examination:

- Metadata and history analysis: Collection and verification through ExifTool to detect the real software, hidden dates, and conversion traces.
- Object structure analysis: Searching for hidden layers, suspicious tags, and Incremental Updates (when an old version of the text was attempted to be hidden inside the file) using pdfid and pdf-parser.
- Integrity check: Analyzing cross-reference tables (xref), end-of-file markers (%%EOF), and embedded fonts for manual manipulations through Hex analyzers.

The result of the work: a clear, structured technical report on each file with a description of detected anomalies, risks, and a final verdict on authenticity.

I am ready to start working immediately after receiving the files. Expand

Budget: 25 EUR Deadline: 2 days

Before starting the work, I would like to review the PDF files themselves and understand which specific issues need to be confirmed or refuted. I have experience in the technical analysis of PDF documents, checking metadata, internal file structure, fonts, objects, editing history, and the software used. For analysis, I use professional tools for investigating PDF structure, metadata, and digital forensics, which allow me to detect signs of re-saving, conversion, modifications, and possible manipulations. Based on the results, I will prepare a separate written conclusion for each file with a description of the identified signs, risks, and limitations of the verification. I am ready to start immediately after receiving the documents.

Budget: 25 EUR Deadline: 2 days

Hello, Michael! I have reviewed your task regarding the deep analysis of PDF files. I am ready to develop a custom script in Python 3.12 for the automatic low-level audit of the structure of your documents and provide a detailed technical report on each of them.

As part of the review, I will implement a programmatic analysis of the files based on the following criteria:
1. Metadata and XMP analysis: extraction of original tags, checking the /Info dictionary, verifying creation (CreationDate) and modification (ModDate) dates for backdating (changes to dates retroactively).
2. Internal PDF structure analysis: checking the structure of objects, incremental saves, and xref tables to identify hidden content overwrites.
3. Audit of embedded elements: checking the fonts used, layers (OCG), and compressed data streams for technical anomalies and signs of third-party conversion.

I will use a combination of the pikepdf, exiftool, and pdfid libraries, which ensures accurate structure analysis rather than just a superficial visual inspection. In the end, I will provide a clear written report indicating all identified discrepancies and risk assessments.

Could you please let me know if these documents contain text layers or if they are completely scanned images/images with overlaid text?

Budget: 25 EUR Deadline: 1 day

Good day. I have experience in the technical analysis of PDF documents, including checking metadata, the internal structure of the file, change history, and searching for possible signs of editing. I use tools such as ExifTool, PDFid, pdf-parser, qpdf, MuPDF, Adobe Acrobat Pro, and HxD for analysis. I also write scripts myself to check specific files. I am ready to start working and help you verify the safety and changes of the file.

Budget: 25 EUR Deadline: 2 days

Good day! We have experience in deep technical analysis of PDF structures. We implement this through metadata verification, layer analysis, font checks, and checking for traces of editing in internal data streams. This will allow us to detect any manipulations with the content. We are ready to start working immediately.