Malicious PDF — malware analysis report

Static analysis result for SHA-256 53480e5feabada2b…

MALICIOUS

PDF

59.7 KB Created: 2021-05-27 18:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82f5e74556f9cf529d0c94bb8137e8b SHA-1: bee5e03e4c05e7192bdf76376b06d43a5a784e02 SHA-256: 53480e5feabada2b3dd4151b6da33f8959161e32949c43f2154e4bff5dd2c4a7
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to maintenance plans, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9539

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=what+should+a+maintenance+plan+include
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad2c501ba---82304974142.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160894b1318f0c---zidumigefelemofirobudiko.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f89d9e14---10203199806.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3537a289---regutirakepevesa.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080a23e0c9e6---mevekaxetexipenatevi.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb37ee2dd---99033232361.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4689dd312---jovenovugop.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9ee07da1ca5b16160168b2efd4eb1cb3/39605242756.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f07fe42a9d---9782943365.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcb8ce284---72327846657.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8f0a33840---zosivulejenikiwida.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/606584e11cbda4fe7449ee21724f81c1/wuzola.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f3b05282---62099657551.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad919c8c610---totukefadifitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df8c.bin
f89cc336cc3aad1816452373c52ae1d4441cbab6fe0df7e56c22f02223ef6af3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 5232 bytes

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