Malicious PDF — malware analysis report

Static analysis result for SHA-256 374e853e75822c82…

MALICIOUS

PDF

72.3 KB Created: 2021-05-29 00:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e27b4cbf65c77486de623b7c3bec808 SHA-1: 5b18be56eb2936d3e4dd795d24836e3a48537152 SHA-256: 374e853e75822c82ef145801a6031e43d6c7abbb587f7b07d206b2e1c1dabcfe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious content or redirect users to phishing pages. The document body, though partially garbled, appears to be a deceptive lure related to a common search query, suggesting a phishing or malware distribution attempt.

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://oniceh.ru/uplcv?utm_term=can+a+wireless+ps3+controller+work+on+pc
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d60bb77c225de3f1021f165acf01e7c0/51710636208.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7510ecd95---tijodefepabiv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872abbd60d1---65583962817.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752bedb86ff---wikedizabaxoxedojo.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/fibazinewonokasonurileko.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075aa72d86ce---30396930445.pdf
    • http://accessoriesunlimitedinc.net/catalog/file/juninopilixobogov.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832f4e9df7d---ridudukukapesarivat.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608720f371d4e---kimezidimepifal.pdf
    • http://rolmech-strzelno.pl/Upload/file/joriziralemedokoku.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785782c0634---92822417793.pdf
    • http://sllight.ru/design/img/upload/file/85972178844.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a25e64dd38---23169465703.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_off0000df2f.bin
1adc8a0be295c0159b5581951c75eae6ca5622a9c1762c8cf7b91e0056cda77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2F 5152 bytes
font_01_sfnt_off0000f0d9.bin
4e95ceba046fbd3a2d40e7001b419f8ac22eb6a986c1046a2bcb5157296154a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 10248 bytes

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