Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39c81d67fed57d5…

MALICIOUS

PDF

91.6 KB Created: 2021-06-24 03:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7d010fb6104a73e11fbbfed69d2058e9 SHA-1: dcafabef0dca64dc43b2bfeb52ada28f63ebed67 SHA-256: f39c81d67fed57d53c69528ad8a6aee45df453c7ebeabc89d4cd5cf2f8eccfde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kovosluzba-praha.cz/res/file/rufojule.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee7ead1e03---53438367171.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/62002267523.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb14794e27---42961507515.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nfu8fee1a027r3fkgngqm9e440/xozika.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5bdf5ea7f89a67ea261c385e371aff74/47469323276.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210617192556.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/fokerufitoxu.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/13e1ba33c5149a555b15a293318efcda/34082092762.pdfIn PDF document text
    • http://beiks.info/public/file/37777425295.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7160c7007608b4a8746e79c348e3a6f7/18715660986.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609099bd387ac---5767231028.pdfIn PDF document text
    • http://klefmarken.se/upload/file/6511471003.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/404d2b0eac87c652c74def85e2c6de64/13046747852.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/witotopusogerawafokenig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=educational+statistics+8614PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 5280 bytes
SHA-256: 93d159e191bfd2ee901f59efe7912c7f0c5f43910ded6bba22025da52beb7ce7
font_01_sfnt_off000135c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C9 12360 bytes
SHA-256: 0dd95c0c0636be708ac7a2977f71e873a75169ed04a52d62166156c8105fd28d

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