Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc31d86813fcbca…

MALICIOUS

PDF

54.4 KB Created: 2021-06-20 19:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 41984f3b8acca17d237f75ed3eace599 SHA-1: 5694f96a68f63ba266697aae35cbe1b566239375 SHA-256: afc31d86813fcbca557c8ae539f17b8a447eafe97de939355b2b99b2f844c7c9
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection for phishing and trojan activity. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

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 http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/93791c9fb37fc22ea60d43893335ff26/kurebu.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cd3f1059c4fae06e71610f7954e9585/64556310449.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vkasg5bsqtmpaag1g4oqd3pabl/zuvovoforejopesipitonop.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/95727402395.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/fubupusivasijulekenadafu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/80b00a23ec1daadc6297a49d5ac24867/vofesojorunuwilebulimadom.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/xufitupisovepawet.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/q55tiaj5s0v7iu0s8h7s9s0h8h/sixipe.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kosilediwogotuwabitadeji.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070e07b97431---jutilisuwanatu.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/21028639084.pdfIn PDF document text
    • https://ive-cal.it/file/38130879424.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/81hppr2cmhj9u6r0rkph7jgcg0/15890549679.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/d4014614455a8720f706ba23b5e7de63/dubuko.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609479f9be12c---lawubagetulegajorofar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sach+keh+raha+hai+deewana+song+by+b+praakPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC41 5804 bytes
SHA-256: 65d6b566411a81dc2f8861efe17144f3640c600fb3e0026f9425571c8cc531f3
font_01_sfnt_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 9016 bytes
SHA-256: 18d99535ab56a455c7cb15093b88a896eebd2cf669e1487f3cc80fc676aaba73

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