Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e31832ea9d756e…

MALICIOUS

PDF

55.3 KB Created: 2021-09-08 01:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1aafebfdc28ce43f2410cf0dd594144 SHA-1: 0dac9be751b6ed2535a02cd5d7daf0764e0e9bff SHA-256: 31e31832ea9d756efaab778b1920c144d0a5d85f8161051cefcd1de6b64c2e93
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6591

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 http://gibeaufamily.com/clients/870383/File/45412501110.pdf In PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/sasigujire.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lujuwi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839c1cb269d---litijibulexogurelati.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ut7plnfc0hhrsme37its3k0ti1/66091174555.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/75498747992.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96779277445.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/49126141905.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/72252793156.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/51544091630.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/e181daa2fa83ae47a0c248498207e6d6/50620569404.pdfIn PDF document text
    • http://01host.ru/userfiles/files/wibajupobisopezu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/27548838e9d27f080ede9a7ce5b3bda7/82272392514.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/nurupubavexelub.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/kivepagubobomovag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=arithmetic+operations+on+imaginary+numbers+worksheet+answersPDF link annotation