Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fca5aa81ed3841…

MALICIOUS

PDF

77.8 KB Created: 2021-06-09 09:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a69069db77773baf9c0a36d9bc2541f SHA-1: 0c11c175ae946f3c2e5ed08a59d3fd6ce619d43f SHA-256: e9fca5aa81ed3841ca1336116e29ff514e2814753c20923d596a6d763e425988
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and appears to contain metadata related to its generation rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ketchas.ru/uplcv?utm_term=8+ball+long+line+hack
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/i90sjadku2o5oabnrg0799ae61/mewafepisusiwelodewaf.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/00dea9616ed1bff4325417f4e1f43d94/fibabinigafi.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf8d68d86---zerofifi.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/003fef3ff4bb0a10b9eeaf3ce06702dc/14675683714.pdf
    • https://activepymes.com/pub/file/37172945242.pdf
    • http://robalton.es/Albums/images/file/%5C/vetezixatuze.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nhgmi36n9c45nuvkfrdda0s1ur/ragananumefe.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/vr161a5g5helgg63ljtnrdodq3/95278644780.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d92c62d---zomuboredowu.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609084d41c0ba---patupose.pdf
    • http://apcmagon.com/userfiles/ranijugigilixijilesi.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f101480f6---godukoxoxekupanoja.pdf
    • http://allaboutdowney.com/userimages/xekepezul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0b.bin
f55fe16254959482c3937ec41d701cacac77a78e4714d2debf3690d101bc1584		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0B 5088 bytes
font_01_sfnt_off0000fc50.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC50 1800 bytes
font_02_sfnt_off000104de.bin
e73d3c2e46ec994e2a2d5c583caf505dc6314f93b36f5721c4f66ef42ae2570f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 10844 bytes

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