Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c1b00a325798a6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-01 00:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9ea1cdbb094fdc139c5430336617dac5 SHA-1: b07ffce29a4754cec5ec2d42c77705bded6f3054 SHA-256: a6c1b00a325798a66c376feb7709912aeb2fa9311134aba7c16428fa3f725cf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, many of which appear to be using compromised CMS upload functionalities. The primary purpose seems to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/bf071f9f07082f84ae1743e482aba120/82184605086.pdf In PDF document text
    • http://carrasvilla.es/uploads/files/64232013475.pdfIn PDF document text
    • https://domilot.com/uploader/files/3092605785.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e96d50414a---84095562544.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/bewojuzeripukuvewo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/12888484706.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/92381800060.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160838d2603e17---pedugeb.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/lemulu.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/mebulataduxoxeke.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/denafiwosan.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160998421143aa---22623377459.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/l3g03ttte4rc5clrpc1mitvdpg/pezulosogeg.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k0gquouchvadrg156q2oqpovdq/jitobaxizegezuguletunawiw.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb994d65bac---8142651108.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/cc4cd23dade7222cfc87352719fd8103/10419452893.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/a58e21076aed8d39561b413692cc0ba3/goduvawivirikelokobad.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/nipopumipe.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/68561569775.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/tuzin.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5523283664497b6bf25ba5a20e23f432/47333598517.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/3b29b2be14f37c5bf8e481eb4b18e8f5/79118677663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=causes+of+noise+pollution+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 17960 bytes
SHA-256: dead36171284de28bdecdede3327d2a2dd1e2596b6cdff4d7125c0c5f8afb3f8
font_01_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 10520 bytes
SHA-256: 5526ac6b95c71b5eee00a12514897b51412ec539d70de101a833a63ef5a2584e
font_02_sfnt_off00013ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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