Malicious PDF — malware analysis report

Static analysis result for SHA-256 b895238efd8d1268…

MALICIOUS

PDF

91.5 KB Created: 2021-06-06 13:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 608eec846e428bea6def7a3a9e37aef3 SHA-1: f877a68288d9b371ffee180b4783cc7c66c386ad SHA-256: b895238efd8d1268f19ef07cea86b3c71b64580c1cf6ff10efe03739289f8e6f
156 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as downloaders or phishing lures. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=conan+exiles+how+to+craft+flawless+items
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/e5a679e962981030d44ef0d9cef84717/37525956254.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/a738dba79df89c6147f5bada49290169/35586082880.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0e6675e9.pdf
    • https://baoholaodong24.com/userfiles/file/8931723713.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43dbe725a---daxepotagolitetaribokuto.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16070f87e9c7fe---92303193636.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8629cb1f8---19616652761.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bbvglvsk9pqaemu9sph2tl6s30/besusudafuluvojovewukow.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8798e34824---34016067782.pdf
    • https://sasalidayanisma.org/uploads/file/vifarulidozul.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d84bce622c25390ee7b6bb337f95ea00/91955102963.pdf
    • http://www.peretprod.ro/content-images/file/37797803035.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3740136a---piwenuganevefitutelukon.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070abf2e6ad7---97153283048.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/a401c1f6cd8fed5c6153cac5a3e6c364/50333563049.pdf
    • http://www.celso.org/download/numizugojisevixo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/169525d3eccdd17669c1709ca5b0cf94/32568008626.pdf
    • http://allycatering.com/userfiles/losokijepuwelagadulurewom.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
    • 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_off00010fc9.bin
bd37dec2b1c0f6208d6a2c36cb3b30c34e274dd561013a238977e14a6e3cb5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 5184 bytes
font_01_sfnt_off00012157.bin
3564053447ec46b0e36b9038929f09ca306bf6c244dbdaad5a3122bc323035d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 12048 bytes
font_02_sfnt_off00014a54.bin
05612870b03df6fb02db0a76a14085fdbd00ee09c54100db978b15ac4afe5464
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A54 16324 bytes