Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e4ff6ca8640a9b…

MALICIOUS

PDF

67.9 KB Created: 2021-06-05 10:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c21deca586c78fd01f14c528589204e3 SHA-1: 7a904e1a4b30de456315a615926818840a1d43dd SHA-256: b5e4ff6ca8640a9bc0dab04bd64413faa630cc92d8da3d4fd54175b8d932260d
156 Risk Score

Malware Insights

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

The PDF document uses a lure of a 'simple house rent agreement format in marathi' to disguise its malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious activity, consistent with phishing and trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://cructi.ru/uplcv?utm_term=simple+house+rent+agreement+format+in+marathi
    • https://accuratesearch.com/userfiles/file/66789531016.pdf
    • https://lawyerupsmart.com/tempimg/file/tudim.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4b9b327f---67873764012.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h7r2mfsqrb7n1ef0nduuhn475h/49439736550.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/39aa85022fdfe6157a2c2e2ed22fed29/79777397196.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16083659e10c22---24327344518.pdf
    • http://begemot-rus.com/uploadfiles/file/2021052020521873499.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a22b4476894---36114688855.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa85ca160---15039396011.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/oug4sgra8bh5d8utaonh279b2j/2243459006.pdf
    • http://amphorabeautyclub.com/campannas/file/89053851366.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adac49d831a---3733469581.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ff4fe8bfe---kujame.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a299a047660---60577284296.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce5f.bin
086152915a73779ca366e30a31df3829fbd9be4a0e144158cbf773c8dcb8b802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 5416 bytes
font_01_sfnt_off0000e098.bin
d838112d111059cc608e33b749ce11bd859d2e5bc3e3b6966cc0f98459f20b0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 9920 bytes

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