Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74455360a62d09b…

MALICIOUS

PDF

63.7 KB Created: 2021-05-15 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772d2ee20cad5dcf06d653aadee55eed SHA-1: bf9f147d3a2bdf5e31ec6e5dccbc10314eda3424 SHA-256: c74455360a62d09b68558d1c2d7e7a1739005edfc7b09c62425a9dd2465a7907
154 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of a link farm on compromised infrastructure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a46ec9f1a566b118d2f5c970c465d28d/putumemijurunawez.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a61ae7bd---gezowumogela.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ac131b83---bidojajojip.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505072044999596.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1eb052c4---53340013469.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/270427e1306a4fbf0cd3ac4d29972558/tunudemevediseratobipi.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/hbtpv6u35im6vvpjosf03v9d40/24844618275.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5dda3e647---40866744927.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc19791765---lepiwegefexujefutoluz.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae2f040693---99962032937.pdf
    • http://alexlunacoach.com/img/editor/file/xetajogenemakajipo.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767eeaecd9a---70170410479.pdf
    • https://alternativecarrepair.com/userfiles/file/41208438882.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fd55ae546131fc37e22cc5429a28458/80866187139.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b074f55475---boxigiribumen.pdf
    • https://a2designbg.com/userfiles/file/98761840814.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=correct+business+address+format
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e30c.bin
90dd1f712ab3758d6864f6d380cbf456e30678027c346f67e262f47e4ed7efbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE30C 5180 bytes

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