Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df7aac81ca2f30f…

MALICIOUS

PDF

99.0 KB Created: 2021-06-04 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d3cf6b857436f42e52fc4ff6c2c7931 SHA-1: ca03a86c14d39f00a60a6dcee7c82712a78b91ab SHA-256: 9df7aac81ca2f30f50dc09ee5cf032a925ae0888f571f0079d93f3e14c677dcd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content or conduct phishing. The document body, though heavily obfuscated, appears to contain decoy text related to a game guide, likely to mask the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/c2dgnmqcoqa83iu96ra3d1t6qt/98856534417.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160771546c59d0---jejabujopekikabiw.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087d78b42316---gejew.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6495b0cb0e4a5a846b63694795d54254/68986662226.pdf
    • https://aravlicraft.com/cmsCart//upload/file/99163201398.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e071a690f71f8149b7dfb5275a35755b/32877885555.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d675479987---fivipatiwuvenijepasenipaz.pdf
    • http://aaaexpressac.com/userfiles/file/zalixuguvozajavejibafubu.pdf
    • https://wegofa.com/userfiles/file/baritazume.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/966q034ahul2con9f7f48tu7gk/73402673128.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lf6k2ckb91aa2a12hmng46njh3/vexupetoteruxipomedaw.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082dd87b9753---likoses.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e927ed8bdfc9d2cd398338260b904bcf/15165852395.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a42f7e134---lutimifitepefifobek.pdf
    • http://altaprecision.com/userfiles/file/pawufoxegadinizug.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/l1v8u50ka9j0h8ekr6elkl1b5t/jidopup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=guild+wars+2+heart+of+thorns+mastery+guide
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014655.bin
6ef4889c07733b7437e42a8afaca9ee0d7abde8e8ec6f7850647ba0b4c420291		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14655 5680 bytes
font_01_sfnt_off0001599f.bin
68d914e9921e2286dc381a4429d7238d2490435ad123b71d3f4f1ebd9b1fd9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1599F 10980 bytes

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