Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd85587c48e8df0…

MALICIOUS

PDF

57.2 KB Created: 2021-05-09 18:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ffbb990a6750a398aaed65e1def8ebf SHA-1: d162603a6b7ad1e25b0794d4ff65f32a03510ffc SHA-256: 8fd85587c48e8df016dbba22316d9599b4e3419574d32c1d32e795fc50e2e5e9
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content or phishing. The document body, though heavily obfuscated, appears to reference a school report, likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9097

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.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1ba080f7---75318525292.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079546465427---jodezorudasaworikevifezo.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/pf7uv2qdg895s82ivbfeblmofo/virepogujapizenatixo.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160865a2348192---gaxejusale.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf8bd7fc9---kopok.pdf
    • http://matstravel.ru/userfiles/file/34956852278.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088ccc86bc4f---tarigu.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/gasijokerasedimon.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609072e282d69---dulitulogol.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160955dee07c43---jasaneluw.pdf
    • http://learningkey.org/userfiles/tetukiz.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e61a75dc---32313354762.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/b3lva1ne49sdmsl3s31jm7rkmr/37835746916.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ea038863c081d41941bc97d97b0f87d3/vutasefob.pdf
    • http://dermalab.pl/userfiles/file/32034401346.pdf
    • http://akicgiyim.com/userfiles/file/sutetujifo.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607051b18ab70---97863780566.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/aeba8f0470469ec0deee9f0f33bc86ab/sanofasopuvawubazo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=clitheroe+grammar+school+ofsted+report
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d136.bin
533bf3ae0ea1e4581b3de5a29d7838c61193f0c3b120d365f43c5503de7f6170		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD136 5476 bytes

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