Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb40334414879607…

MALICIOUS

PDF

68.9 KB Created: 2021-06-23 14:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: f4eb1bece40cc6a449ac5248cb73eef5 SHA-1: c8fbd3ff714f93e4337374b2e388af9098b38df4 SHA-256: eb4033441487960746d6146d4e32f01f67a84e06a425b57fe5d29af1073b61a5
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'Bosch pof 52 router manual', aiming to trick users into clicking malicious links.

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://laborke.ru/uplcv?utm_term=bosch+pof+52+router+manual PDF link annotation
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jbo93lminj88vgn0uaptv61c81/larofewinafujavolizix.pdfIn PDF document text
    • http://hasyo.net/files/file/situgasejifupezenawide.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/fa14ab78e9144b0eee1cf2e0c3ee6b6d/75086033070.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/baroge.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/vibagafagibekor.pdfIn PDF document text
    • https://mytopics.it/uploads/file/90487165037.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8d19ebcb---darazelexamika.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/d010a2146a4bc13d3859a5b1862c2d42/74587670025.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hor2te18c7pgl7o145hhhhlmaj/vipalujajijojezovopubexa.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07a94af6d---pumabafizumanoxejov.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/1773884189.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/uhs5dfusovtn8lrn415sgao4vm/17023407562.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/20dc58bad20b38180549bb98c6addd9b/16953391107.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a78f5ffb794c16acc364c8ebf596cdff/53463788613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC7 5560 bytes
SHA-256: 3d083d87866155d5c11c8b256e5508e76b4479f320afb3b6493442ce419fb01e
font_01_sfnt_off0000e28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28C 10560 bytes
SHA-256: 2d0d4ec964e9955c69349230cb84afd7337e9cd4544d7b9b34c72b1123c4e390

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