Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e4c96b5330acd…

MALICIOUS

PDF

66.9 KB Created: 2021-06-12 14:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b08e3a4d8af5e1217c0f1605f508ba40 SHA-1: 00c8880d3ee02b98840995e51ed262e6a93757b3 SHA-256: 723e4c96b5330acd2d0255100b6e3a7396d35e1fa13a6f595078588fe7d5c4e4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure for a 'technical manual PDF'. The presence of external links and the nature of the heuristics strongly suggest this file is part of a phishing campaign designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=aabb+technical+manual+pdf PDF link annotation
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/efacc64d693b4b8010219ebb40b37079/50469549554.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084bce17bb8f---53072015186.pdfIn PDF document text
    • http://kotolantopeni.cz/file/vobuzudawepamuvavo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/8586219741f444075656bc07a6b9ae03/dezaba.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/10467497131.pdfIn PDF document text
    • http://vejwun.cz/images/toxovu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bee454fc6---roxiwageviju.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/94408619859.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/aiimd6vn4rc5ljs213228n7i3b/78433146219.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/9f621494f505d9b8a728331b2b0324af/83450259730.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abe5f1a9db5---26246282320.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/94011684390.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_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 5248 bytes
SHA-256: 1b093d1ece63f4a9b39094755b21e433c2363a82afc1c1e5965c87e2fd0e3cc5
font_01_sfnt_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 10632 bytes
SHA-256: 917b266b0684a36fd2dca8462014c7d40f34616551a2dc1867aa9043e2e4ba4a

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