Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ba1b873024784a…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 15:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 22bcb31821be7a5138afda89531b5407 SHA-1: ef2c574a281edbbd7646b0324e66d75b6739eb48 SHA-256: 78ba1b873024784a4a0c2c0159032fd5fadcce39b2a6588707b8f282e8bbcba2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It includes numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/da1faaf2104b30b116f7920f5ce35701/wusakefufokojazu.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3835207181---kawebumasivad.pdfIn PDF document text
    • https://www.pbri.in/ACP/ckfinder/userfiles/files/nirakoxotaxegesuf.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/sepapitupogonuwa.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/menurefak.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9a867f09---belixokifemapomi.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/47996747702.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/43fc393627283e0c724e744ccbef79fc/sewudiloma.pdfIn PDF document text
    • http://orosweb.hu/userfiles/file/98650314977.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085174c64250---melolipesarowubulerup.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/68bd6c588609d10d235174f5b3a3a9ed/kaxeful.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/bosarimokawepapakorax.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160770e4b320c1---22385987394.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l275t2n0dfpjbelgj4oel8r2m/82176924364.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc68cb03740---ketas.pdfIn PDF document text
    • http://dyweisheng.com/uploadfile/file/2021072717502973499.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160782ea11846f---86350822788.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/rovoxukasimiwodewovot.pdfIn PDF document text
    • https://menu2uplus.com/images/file/jivaroxufesoxaxo.pdfIn PDF document text
    • http://jarosi.hu/files/file/fefizoditem.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/labusuzidazomumimesu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/8120dd4c244a4e272c2b69c534025d9f/wewuzetusowatox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+farmer%27s+bride+poem+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE93 10652 bytes
SHA-256: bb21a93f3af21d615f04ce9db210b5effa97640d2eb64a0b1555685a7a22d86a
font_02_sfnt_off000106bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BD 17104 bytes
SHA-256: 728e2941cb41e06d7ffc0a024ceb71b1e6a185d41c9d8a9e7d5bd618fa5a5023

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