Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8592b9ef2bbbb16…

MALICIOUS

PDF

66.7 KB Created: 2021-06-17 14:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d76b665f8e2ab50bda9dbb1b76f0c8c5 SHA-1: 75c99978e021e80b856c972416c8f468b6e1f915 SHA-256: b8592b9ef2bbbb1611a9e5b13930dfc8529460962209775ca89957c68f17b684
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple links on compromised CMS upload storage reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/84aa864437bd0e2a2e95bdba363b4bfb/15289949279.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/078e29faba07f34ffa1807c631966733/sutejowafobepozagadizilob.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0aa1afaaf---78385587479.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e9kffant8p1ql4busf39rin3qf/54480483351.pdf
    • http://arci-mp.fr/admin/File/kugafowonuno.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608a151fb4ac5---16373817423.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608167602a676---35918846311.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49fb9cab5d---65778125294.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/de11ngua6ho7grdc9v8vi5tn0o/ferufapexezekadozowevo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607055c29336a---gipirifipekopabevugup.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae57547d3345078b3f5f58b1eb9ad7d8/11689023402.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/21da5d148ac4f802cc35c7a5d1b7a75f/nofonizirekosemibubolu.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dfbim9t7a0nnv6cf3k5shi3sna/lutefijipojavozisiju.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/454e458c69027016697afc17b2e26942/foguboxolabudaforirixexaf.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091742c72f24---wasirakipejugimatowixo.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/192fe928da8b9c541800bd34dca348df/kozisunuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=cg+pre+b+ed+books+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa03.bin
060d708b1ff822ef5a4df2df376d9b0ed9df75bb42878d8f1ac9520833db51d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA03 5076 bytes

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