Malicious PDF — malware analysis report

Static analysis result for SHA-256 68d6912a5ca4e07a…

MALICIOUS

PDF

138.6 KB Created: 2021-06-22 17:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b51dde7f6fc187b97b5856fcb06c7d69 SHA-1: 6c61124fd5c4936d5284a87786cfd0f54b54c7ff SHA-256: 68d6912a5ca4e07a9bb7a086f1df56c6a4e5ed1c7c4ebca816e9eaa898de3812
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7mueimh2okcopsdl3tak5gk1u2/jelefavuzujewapitonumali.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ftv27u5ip3s7htdjb70fs5vhi2/68592708572.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/77edfaf91032749ae4c7adcb576bc41f/3080045187.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/91865425613.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tqcqt3cg25e7d2ns3cmgtul4to/65259956773.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/lomurivudun.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e54d62f2eb9aad0df03b31554887c723/56100736976.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/98401482035.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664657874---25218939729.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/02d4ea4da2cc226849decfce174f5432/sulebifakale.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46150b2554---furutitikojozuladodaxe.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/fowemaxudowubogaxe.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/a1d5c7bfa53c06ea151a786755d0a76c/82033850829.pdfIn PDF document text
    • https://ikima.fr/uploads/file/wunoleretazujetot.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/04ae5b2d954c5028b467ad2e6d2af8a7/xunudiladifonadudepazawav.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/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=fundamentals+of+momentum+heat+and+mass+transfer+solutionsPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCF0 5104 bytes
SHA-256: a58857f39c1ef125dcfadc60ab92186939ca8148c285f797212f608859654532

Open this report in the interactive analyzer, or submit your own file for analysis.