Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e39715409c7a7de…

MALICIOUS

PDF

84.0 KB Created: 2021-07-21 05:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41c2506bf15f317fe2f4e4a5b5f8f356 SHA-1: df9a333a676f48ddaf93577662375cd8ceae185a SHA-256: 6e39715409c7a7de74b229e577df4a6254f09a10d5e02f1cb6c1358bf93cb4be
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee940517857f12c2dc60c2f01481ba14/zuxodugufa.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078dddbe77e9---42750145174.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608719a3736db---3254877827.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vr39llej27o33t8b3h2483t03h/vexitokegerutajitelazux.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/550cba82f964ada8fce283811210e7e0/75589997380.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aa647859fc3---jifazu.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89ebcc1c4---58062859512.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7235c1ad---wisefuwen.pdf
    • http://extracam.es/app/webroot/arxius/file/dezenudekowowefofu.pdf
    • http://profm.hu/files/file/kasaxepujasesave.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b399ace78---26390280492.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3e8a0bc1e11928d55192d9028126401d/42963860455.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082aabec087f---xamuzevenifakufarowafo.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f458586a7a---85348396140.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/948cs4v64q694n0fa45ktq4j9j/figowinoxividogeruwukeza.pdf
    • http://rcsiprojectracker.com/userfiles/files/momarivagawadex.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a491f9c34cd---45911149531.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9d9c45c5---71918149140.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871c4a394cd---pomizazilali.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/5d4232be86b597bdd2a117d7a81c60ce/85808146048.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6a7d5171ac12130131a82a1ac2c01034/kutusobakavireferefim.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/vodulikiruvoxakonex.pdf
    • https://balajitutorial.com/admin/userfiles/file/31292004292.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=multiphase+ct+scan
    • 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_off0000e8ae.bin
66ebfae82ee9f629c37df0c3e126a220eafd0daeb5d6d1df3b2abe3abfa405ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 16460 bytes
font_01_sfnt_off00011381.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 16792 bytes
font_02_sfnt_off00012b98.bin
50f4deab5d3db89a52dc97cb09dd2b0afb7c3358fbaa67c1d57d4a63dc1da1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 10344 bytes

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