Malicious PDF — malware analysis report

Static analysis result for SHA-256 b524cdda63d3b242…

MALICIOUS

PDF

73.5 KB Created: 2021-05-30 02:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bcfaa9ace2232a6ff376362b5c456ad SHA-1: c7ed227010dc63a264a059a9d2b21f62dc4902a6 SHA-256: b524cdda63d3b2426fa35ca1758f38453c416a0137d237986c7c528ec4ccd0fe
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the nature of the heuristics point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8945

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://crysiq.ru/uplcv?utm_term=pmp+exam+prep+rita+mulcahy+pdf+download
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8189df598---17457742385.pdf
    • http://caratow.eu/userfiles/file/nezemusetosutewuvod.pdf
    • https://legouic-peinture.fr/userfiles/file/90323811196.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ada6b9cf---zabodasufuwenuzuw.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a561576ee10---29854570020.pdf
    • https://bamor.org/userfiles/file/95685460208.pdf
    • https://a2designbg.com/userfiles/file/2142663429.pdf
    • http://alibabashipping.com/userfiles/file/74957663902.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45d508ed7---33872936212.pdf
    • http://beateromer.com/bilder/file/55341948320.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/1c76f3fd0f9c59c4471592c8c11b7679/72033868331.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f05e20fcba---30800278669.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bdfacb70---dotopun.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e63b146d01756112722051106071e257/xeberowinedusupage.pdf
    • http://ahcxdq.com/uploads/file/291353346150.pdf
    • http://activesolutionelectric.com/images/file/33194355113.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f254d6fe55---45066607733.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/bfe5bc5949ee175cc3954d0a63f37ae4/86588259196.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f714.bin
04411da86fe655cca7287a3cf629ec99036feecec791bcf4631eb3c38c462514		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5480 bytes

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