Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e5398d9ac34512…

MALICIOUS

PDF

109.5 KB Created: 2021-06-22 12:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fc00a400bc1d5f2931f454dff2f6cfa9 SHA-1: feb2fbfdda21857aef1e9fc7bab75a167845819a SHA-256: 26e5398d9ac34512e62325ff7291090ffe389620ec16e22f9aafb68c3e26030e
154 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'Infinite Warfare zombies walkthrough', indicating a lure to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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=infinite+warfare+zombies+walkthrough PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c8d01cf6---59272074032.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/jrpfjlcp491po5plu4mci3oo8o/82702466689.pdfIn PDF document text
    • http://dzbnf.com/upload/file/%5C/30861591834.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/vaboneze.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d5849fcabe01e7b15358248c093b4649/tirewuvutufoxizupekaloliz.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/91683292351.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/simenitefatoweme.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/69871057216.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759ed42c98---4070070552.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a67ef8e6---79973986880.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/72bfb1d608d905f2e3a489494333abf7/61429193511.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ar7som2cp2mlaomtb1k89q0704/62567563358.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/4f53c357a7e077c2eba2b1b95507755b/litipewurewiju.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tp2op1b4f0vs9si0tp3kl5lcm3/24527929579.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CDE 5464 bytes
SHA-256: 61066136a81b1f32f81326e553ccdca19febf1938c824345f43debe7381816d3

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