Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb92052d95fadec3…

MALICIOUS

PDF

76.2 KB Created: 2021-06-19 06:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0298a1c769efa4f685429567222b686a SHA-1: 4478ddfa1a45162fa674c01a2b11169bf48916bc SHA-256: fb92052d95fadec31aed8412b151e7545146741fdfc89aaad9d329ef802cbb08
154 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, and exhibits characteristics of a link farm. It contains numerous URLs pointing to external resources, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7781

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://laborke.ru/uplcv?utm_term=iso+win7+32+bit+download PDF link annotation
    • https://vieclamxaydung24h.com/upload/files/94385756314.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/rozupimofuxolejo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8b0c3365a7dda4ea529db0eff5e6a89c/56707774105.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/59261920095.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a38f20967---nizufunasuwafebolinu.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4a4b37287---61771234046.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b33287526---58231446768.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vivuvitirilarowiwaxa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b8440ff90---jugeluxatuso.pdfIn PDF document text
    • http://praguetransfer.com/files/file/tenobugesobol.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6g3s7ss57pleq52pfnap93dhq7/zuriwafo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5632788aa4eddb1b3891af2177eb7d18/vefuzomorugudizawu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/051552087511.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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 5268 bytes
SHA-256: adc6ddf29dbfd4f0b7acfa7f29cb5ec9417e9c7889c179a446cf24b36c736629
font_01_sfnt_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 20364 bytes
SHA-256: bfc5bfcef574200bfb8edd5e8a3b68fc2894e730a6e0c0a5a1588dfe8ccf4dd4

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