Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20bfb304b2ffeb5…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 14:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a1f291d10d2402c36d2e082d739704d SHA-1: d5572a41281935409519a25f517f4533f048e642 SHA-256: b20bfb304b2ffeb5b54285a4ba2269d0d4a0fd795dee0bf13f4cba6812898041
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting it's designed to host or redirect to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/7e4cf43bca5180a86ab6d6cb1c6b2987/28313544358.pdf
    • https://isosklo.cz/uploads/23984205269.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/guu0fro8som56digluqlk9g3q3/19172477086.pdf
    • https://viboot.com/ckfinder/userfiles/files/83020896233.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/lg5tthouhv35g7esiun255r8pu/78758630791.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086c15a63596---65423371309.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f5d7570de91a5d7dc95fdd05088bd8e5/76863824761.pdf
    • http://gardatrans.com/content/Files/76943331789.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/segirowadubepo.pdf
    • https://cowichanseniors.ca/userfiles/file/nopinurojigeje.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/p6io4p9oqrtqsjf7i13nntdf5u/wivuzatapewixinilezo.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/rodesopamenatara.pdf
    • http://merlegdoktor.hu/tmp/sododetiwamuvaw.pdf
    • http://cartopack.com/Images/file/xewebojaz.pdf
    • http://dreamscar.eu/userfiles/file/saluzo.pdf
    • http://maskaevlawyer.ru/userfiles/file/dunanowigijabe.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/78d1a7bdb5ad088243a7c27af7b697ab/66493807938.pdf
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/xolevuwosavodotepinomi.pdf
    • http://fotossc.pl/_files/file/12189631209.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca18d26752---83431920672.pdf
    • http://argol-editions.fr/userfiles/file/5903585676.pdf
    • http://mnarch.it/userfiles/files/48706767899.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3cb83da8---61804527512.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=firewall+concepts+in+network+security+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_off0000b9cf.bin
7d608bfbb8181567adb0a0c9bcfa3d897adb4bb52b4077049ae7efc5cdcfaadc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CF 14196 bytes
font_01_sfnt_off0000dcc5.bin
7809ca54a368f44b40b1d4d6db16193101360e286686af73a9f02929341497e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10984 bytes
font_02_sfnt_off0000f673.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF673 16792 bytes