Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3a2f971ca0681b…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 20:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2229d703fc38581c184d7b36fb027c3 SHA-1: b31a1813fa55842ee5145283d96bbe20e05b53df SHA-256: 0e3a2f971ca0681b67ed4aca78e0bfdc6846aaea6ed0026a9c1e224dbe77ae25
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=science+class+7th+book
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7d947defecc07556f277d16e1570d6eb/xefefotegugevusawe.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085ee1f5249a---50627843907.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e32ccc34c4f---40575945204.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8c4a26c2a7128c670e5cdd7a23db1530/33917513594.pdf
    • http://wildpflanzen-planung.de/file/kakopiwew.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c6d8d77ca943d2a2f2450bdfdc45db16/joxafibodamuba.pdf
    • http://oletrans.sk/editor_uploads/files/gopozepuve.pdf
    • https://emmaushuis.org/pages/35234405291.pdf
    • http://activesolutionelectric.com/images/file/82157526014.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/03klnumt1ng32ghj753vst2nr6/98542597441.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/donokarijinezut.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/057598ba55aa5597f6bd08b2c539626b/66722719150.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e52b7bc8---95606354409.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8a465d91ae22dae3292d6f9d2354899d/65042796875.pdf
    • http://security-m.jp/tool/images/file/buleli.pdf
    • https://annjulieskarpmo.com/userfiles/file/2061246150.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb7f5415af---vulemirerodozatavikunelig.pdf
    • http://rafaelokazakov.com/file/releguporafejafig.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/uebnfv4aokup0odgd6vpknedbu/46199677948.pdf
    • http://agcslohian.com/userfiles/file/18871210894.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a8c61f9d2---53331177720.pdf
    • http://chukgoobok.com/files/fckeditor/file/99365707075.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a863e45b2da---mewubojodosejefatu.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f447.bin
467ac6d01fdf069a3fe19d40d8c506b487b0b57a198d3e0e3e58782695c262fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 10584 bytes
font_01_sfnt_off00010c71.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 16792 bytes
font_02_sfnt_off00012483.bin
ee5adfb57afa20565dfaf638b34bfe1e7248f53e603e543e84cc4c1007d5c49e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12483 16864 bytes