Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a4bb4f0f0f1b81…

MALICIOUS

PDF

86.8 KB Created: 2021-06-23 05:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5dea15a866b21d6b3aaf85bcd4fb92e0 SHA-1: 486b45cb926a567a0bcb3dc2dc1caadb1c5a4c0c SHA-256: 88a4bb4f0f0f1b81c85e5f39c48edf2055ea2a11275a9c1e1e3ba567fd982894
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a 'resident evil 4 texture mod' lure in the document body and embedded URLs indicates an attempt to trick users into visiting malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8470

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/uplcv?utm_term=resident+evil+4+texture+mod PDF link annotation
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609696fe60160---23665206051.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092b36ba2974---sopimejulabuvilewabogunop.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/08c940c74dd0f249094d1a6236275d97/bagebusamasetalekux.pdfIn PDF document text
    • https://argumentua.com/i/file/57809371425.pdfIn PDF document text
    • http://proxima-design.cz/files/file/25646564057.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/77092428837.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/kirenefitafetejuzuzam.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/jonopuminutivotuzo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/n40pdasg4jqv66pvcgi8m14dka/waxupobajatefoligujuf.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/06d184f4ac2cc867bdf5230bcae90dfe/40050039440.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a23297e50c94ca96dc503e4de4eee41/titobuvedopukugaxopar.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/xemoxeneza.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608924b132fb5---42485867027.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a516ae424---10614842030.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/6558edc752c006d2003923c233cef4dc/wutosobolojupewerenodafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 4984 bytes
SHA-256: 26b369fe8a396da86cc8d05c51bbe96b464c2ae1ecdeede7e3218190dcce6464
font_01_sfnt_off000118d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 14764 bytes
SHA-256: 50c29f10580d5f262a1ff1b839ba7310b9b5a053f6af98a0be48f17f7312678b
font_02_sfnt_off000145b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B3 16200 bytes
SHA-256: dd8a01d90701d8c526b8b1392db5416ae5d05341aab0cdd5840b3a76f460e31d

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