Malicious PDF — malware analysis report

Static analysis result for SHA-256 3124461cf41f6b4f…

MALICIOUS

PDF

80.4 KB Created: 2021-07-20 13:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 538c674c2a321e2469ecf1ff0874c1f4 SHA-1: 33d7957721b16c7a41f3d5d7b0f6daa3dcdb574a SHA-256: 3124461cf41f6b4f116b5f4f85e40c4ad289b06b789660dadc40683c40cc99b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm, with many URLs hosted on compromised or disposable domains, suggesting a phishing or spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • 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 http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/jjbmg9l08o4rm3bj9mk0vvqit2/dunowevologoke.pdf
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/30292451412.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7547ce33d1---53663790732.pdf
    • http://pobierzplik.pl/uploads/files/65427243900.pdf
    • http://simonide.org/userfiles/file/wilijawu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7276fc3843---75554806289.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/584p3pe024tl3b7qthmqd8fpi9/xutubu.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/13382791836.pdf
    • http://foto-klub.dk/userfiles/file/28822004878.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/lunixaluvivijotimev.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16076f3ed6ef32---niseka.pdf
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/35421325405.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/18lu3mhmf76r5dvqibjs07en41/61107346605.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fgbprk4qgnhjgn42ajrk6t4te6/falig.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/jorirunisadajebodasopono.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/18859772d2264250874484edeb538fe5/37177066082.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ff96ce50f---93829922045.pdf
    • http://bigxra.com/uploadfile/file/2021071305203073499.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/21393169976.pdf
    • http://snypes.nl/img/customer//files/foligelagapotetas.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a290c2e134c1352b759fb988554413ee/surokefunakokemuwuruvitor.pdf
    • http://argol-editions.fr/userfiles/file/kotanip.pdf
    • https://morganmethod.com/ci/userfiles/files/mebedijawoneke.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608660d7c172d---52379636447.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/5bf98712544d34ebd31baf6ba1401dd4/9005399430.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=safety+plan+suicide+template
    • 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_off0000d752.bin
629ce26a2fcba358dbd0e8ef5db6083f6b6ee99608fa7ff31eec032e4a5f939e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD752 10848 bytes
font_01_sfnt_off0000f058.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 16792 bytes
font_02_sfnt_off0001086a.bin
1ba7e049d722a1bd99dd2ad8564d07abf8eb54022db8b84c864955d8a6a77ae9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16896 bytes