Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2f7a691fb16d77…

MALICIOUS

PDF

91.8 KB Created: 2021-05-12 23:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f95459a98129349a60f7886bc37fcd82 SHA-1: 9978f2e5aa156339c4673dcc4d8015ded39a8aa3 SHA-256: 9a2f7a691fb16d7765af9811538edd42a3ae228bcb0fd1577d06ce3a1ae6d788
154 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 0.9394

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=clear+plastic+sheet+home+depot PDF link annotation
    • https://angkortaxiservice.com/userfiles/file/fanisa.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/fdda6011147d1d246ea9a09e3024197d/vijisawemutumatoz.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/027abcf281cba5582fa551ecefaa8fdc/96809444061.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/9ae4c5c7d1b45fd7e78ea6cfe426b82d/wukufidinunifitetisaxot.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160847d8bcd7d2---6451619789.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3eb7eb865ba865225626fddc20a9b065/65509591765.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0ef99db889dad61829b1d45ff9e19958/wosikedezejetowatane.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/975677e922b5f6d010c683cdb4df07f2/nomeper.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/39239525958.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/fp4difmstpgmraftuomijcjnl6/38918758385.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/40olsvk2rv7c1bkmfr53g4hm41/kigazutupoziwaro.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93c6f7af---zujazodemefokaxararu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/010626111476.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/bb9fc76d3d4449c0b983d73e3cd363a5/55643208520.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d5f8ca831---30788842909.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c45764e2822bce81fec714752fdb96f5/48183274481.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef28426ac---43233391709.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000137c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C6 5020 bytes
SHA-256: aaec61524ec25f247e8ddee184228040a0327dbb5a45ea2f7f28d96125d6b6e9
font_01_sfnt_off000148d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D5 11536 bytes
SHA-256: 8d4ebaddcb50cbb57ddf166d91c742b8ad36fbb29ab3f6db14bb345d56b2ff63

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