Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c2dc79ef8b9b05b…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 16:28:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97c046cb5a75f3ee5ae9eccb1398fdec SHA-1: d60b6a8c10941f8ab0fd3fbfd48e412095c2252f SHA-256: 4c2dc79ef8b9b05bf2be259064144cc5776c36fa4663685520609efe1641053a
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa4b021f5b---26151432456.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085908d6b2e6---68268031740.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ed7078470a7b8a27ef69331071fc05e2/jaxaxek.pdf
    • http://fence-alarm.com/userfiles/files/xujawovavomulogu.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/d59f689a636bbd37d0bcb8beaedec115/votosu.pdf
    • http://aep-tc.com/cache/fck_files/file/seniruxawezabovusurizeka.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1a4d87ab8eb108151ac1426728644b5c/36601821210.pdf
    • http://cuatro-pr.org/sites/default/files/file/89722417759.pdf
    • https://pmms-online.com/assets/file/nuremokapapotazoxavadag.pdf
    • https://lepjunk12.hu/uploads/files/najewumepu.pdf
    • http://mai-colle.jp/userfiles/file/gupozasujimizif.pdf
    • http://herbwaterthailand.com/userfiles/files/vomotidopiwijuz.pdf
    • https://aartipalette.com/userfiles/file/49461711519.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/f7cff54bb6b84ddcb3b1c1c85f965d1a/47216497130.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607298accefdb---29019205892.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2pfrn5ludf4ne9c4du0mtk6k12/pititadelinib.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160785a59bb0a4---98540565398.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef77e5153---notejorunebavezetuximu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b054c2da6---badereji.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a814aa3954c---46862185237.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c12e6e400d---kufiranujotob.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076fce817654---rinijerolurumax.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a38f6e0b9---57127260126.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915ac3bde57---segadirix.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/4203837f01353b65f349603ac8fa6eb4/64402262073.pdf
    • http://akinmedical.com/uploads/file/62858947062.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+time+and+a+half+of+12.50+an+hour
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d8.bin
2d9af70422f979e75e16a3f7a4a69a1ee7653eaa52fb63aef4130e68f9a018b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 17228 bytes
font_01_sfnt_off000126e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126E4 16792 bytes
font_02_sfnt_off00013efb.bin
540533cb715af7e78166bcce5acbfdaa830209d6cc5be196500e478cb1090a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFB 11208 bytes

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