Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6deee706871b4f2…

MALICIOUS

PDF

85.4 KB Created: 2021-06-08 20:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9492e5bee7a03a97eb088f8dbeb3db8 SHA-1: d48698ad68bbd5cb2a7a53915a4e090f57edf0e4 SHA-256: a6deee706871b4f2ed94cd93858af11dcef0b123a0f749bf6fa365eabd9a4b09
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users.

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://medvor.ru/uplcv?utm_term=ideal+gas+law+packet+answer+key
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160960ae8d8198---4107159985.pdf
    • https://paklya.su/design/img/upload/file/mugutigoxanotajekinux.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d431ae27---mafizukivorog.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ecee45eac52fdd0a2bbe85a9abf600be/pubunuzofibikogozu.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160852cb7a74e0---dobafaluralerog.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a59513db39d---lapuluvopevegagisalu.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ada23d9ff8f5144d9355899805c258f9/46466053639.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6d888db85365e788b3d10a224014b05c/58257321506.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ee844bcc4---17023542231.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077691736a15---gowenerovukoza.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/c6c3473d230a92c4aae955e527b84881/gusoga.pdf
    • http://absolutelyneon.com/userfiles/file/mijabuvumanixubunivokidaz.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c9b7ccd71056ecd4275af9b176e490ff/korutepefaja.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/sivap.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a64bef01976---jotuvujera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5d.bin
e36c9eaf658cb4fb2e6748ccab7ae1137600e69b27b114ddd593eca26fbc37dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 5436 bytes
font_01_sfnt_off00010d05.bin
d906838b59dc363ad5cfa6e7510057e8ad590772c1fa247738a1b3790c8be286		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 11108 bytes
font_02_sfnt_off00013314.bin
f7c959ef3840947929b2fbf21a6f844c3d2ba9157ff04f9c13ff486e75cc34e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13314 16192 bytes

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