Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdba8735fb6a2ea…

MALICIOUS

PDF

79.5 KB Created: 2021-06-17 14:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 017ae70d19f5b164d4d4f58682cc9b7e SHA-1: ef611bea6b08bd268f3806838cffea0a8ddaf877 SHA-256: 6cdba8735fb6a2eaebe132d7fa176309097ad2d9861ed2696a2985a237c27ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. The presence of numerous unknown URLs indicates a broad effort to host malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad18f1646---8459109621.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kvocin469he441u7ee2n7moo3c/51096869745.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4909205d4a---tagovumujuwudowo.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/kiperoji.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088089494622---97352576863.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/73731137072.pdfIn PDF document text
    • https://maturana.cl/upload/file/fezumawosovuturawonarelo.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/44f3c10521b118a36ab97c884322ac0e/vefomubafefokebazi.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/35345337851.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/pdchabqeft7dh5tbtuqn2bf7r6/24950291890.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/216aea4dfbb48e0ede06cf9d3b84e4f2/21273061605.pdfIn PDF document text
    • http://dgjst.com/upfile/file/xinixabadeburikovok.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765b356ae50---78971836803.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/oldgb158mje20gn3raj7rb5n30/rimejonigufexagetoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=code+of+muscle+legendsPDF link annotation
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 4940 bytes
SHA-256: 1028a7286110d5c1adeeb72ac77e3fa73f9a52376743c989701c10f758ad450d
font_01_sfnt_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 11072 bytes
SHA-256: 121dfbf49e61dfcefd33a8d8f87e42aa2adddebebe110544807f4d566abbcfb6

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