Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a94d13ddbc32cfa…

MALICIOUS

PDF

89.9 KB Created: 2021-06-17 10:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9db81d66f3773c5d5258c939f7ea2d28 SHA-1: 392ebfbb0f76f5d346c20ea9f4d800bea3054d44 SHA-256: 5a94d13ddbc32cfa17b7d3a8049936c0e7ebf588a7e5c9899ec2515b27c1cd96
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://huntic.ru/uplcv?utm_term=teaching+transferable+skills+worksheet PDF link annotation
    • http://imhkayseri.com/resimler/files/tamufesesamoladit.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/bojujotupilowojisosadalod.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16dcea565---laxenamotesotuv.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/23522383394.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/robatubagob.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec563421a1---vagedi.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6835edcb7---bibuwodexixenilu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c76f02ae04b1ad1a911cb7dcf1eb3913/85144226369.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/86960281265.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c7a59061e---821611068.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/saxegavekugadoxotojolok.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/u3v2rkosd8pj0f7crokc143o0o/89502909091.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e04066ee---45060777821.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098930c72a49---99729108989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 5388 bytes
SHA-256: bb6289bf5ecae9a6a15aa0fcdca0d331eee1adcb87b7d32197931e69fc998ff0
font_01_sfnt_off00013902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13902 10032 bytes
SHA-256: f5194bec016fa13eff20090171633e662c31b37935a6e29d3772f85ef683f4e3

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