Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96426b987ffe2ac…

MALICIOUS

PDF

76.3 KB Created: 2021-08-28 10:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a84056aa89efcefa33c4d611144b2ea8 SHA-1: 48a465aaab070011aa9b7450fbd6f7d27d5aa635 SHA-256: e96426b987ffe2ac74116c3685c91dc3237a5595de5898cba1dfa275c971fb4f
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb3888f44---33800287687.pdf In PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/992e72e9a2b4abd509b3ca8afcf8e915/vogavoravezaxafusowifan.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/5002410581.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db826ce0a9---71979540382.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8t5th0v8okdu5rsrj9q978610b/14241279570.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/18287560348.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/vj90c4vco562blgjug6a8nqf8s/kefozufuxi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a803c85c9efb34fbb469e5e281bc91c7/25846778707.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607857d42f8c0---funuwox.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160793ba42db59---73258830854.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/ketuxajowufado.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b88bec04fe8---88439701925.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/pegowexijedovovivaditeso.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/jusur.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/79231558643.pdfIn PDF document text
    • http://lossfundraisingevent.com/clients/f/f5/f5ed5e364f2f51aa46a4c5982fab9a07/File/nupate.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/64401814607.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff040bf78ad51ca5e367a46f2514185c/nafun.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/19812066279.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/lokemumagaxekupafabewu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/lileparixibirol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=parts+of+newspaper+front+pagePDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/43a6d2b0a60f37f3500c762874cadc59/wumavabipige.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 15864 bytes
SHA-256: c1c021805364b45e9cf328cf4e49a2c7ff009bd34b263e9b20b024b868537b3a
font_01_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 10484 bytes
SHA-256: 03522fc29cf435a9d2ef7ba9df9d7966b44d0289533793546cfce71338975afc

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