Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cb155ea62a5bef…

MALICIOUS

PDF

59.9 KB Created: 2021-04-30 06:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab146f626a1ac6c4eda8b34bbeda233f SHA-1: 01da29a812e1f2448e6a3d7f37d0ab20d25de713 SHA-256: f2cb155ea62a5bef7daa276c7b5b85db689a91aed052a93319fc049839b37028
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8119

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://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41f740354---53714296746.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/fed6f3d88ac0165be6e6d751925fd7ad/sakusifumowasex.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5cbb58da0---niwebagosujeto.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9e03efda---39313792398.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4e20b789f4d33055c4418f2898981119/27028033186.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3d3bf20fb---8100017143.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8c6e9c3fe87de59b1ee5c741f28a8a8/wadujofufujixu.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d057f36267554aa35f0e1dcdd3a38578/3981639836.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c0764370d3ea7f159ab80d64926b8221/59618224699.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079529f665ba---gutamez.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aabdcc7031---49642985026.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a4f9d64a27b976c0832f996346cab02/6549243229.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00d97e546e6c130091dd83d20fa0f0f4/65197357284.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e22b302ad316a2f67d381d873b2c2e19/90234949176.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080ef7595c01---rowudadeditezemawezu.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fafa00f608---60786455250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ordenar+palabras+en+ingles+para+formar+frases
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df17.bin
ad3465827dff21e0835938cc6fa9fb5e13f1ce92b0065ca90347a82e40665c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 5528 bytes

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