Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc433bf9e3bdf6e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 19:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ecef1cce24bb4ac6034da80b27a69c43 SHA-1: f951aab6c8c809e283314816ea276526a62310fa SHA-256: ffc433bf9e3bdf6e7c57108d0f70d637ac814b77fc820696bd044ca6fffb51d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=the+greatest+showman+rewrite+the+stars+sheet+music+pdf PDF link annotation
    • http://cesnek-vysocina.cz/UserFiles/File/8857167723.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba81ed0b9---71027191853.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/14ea0373c01c1a3362eda7413f3e3aed/sumasotapug.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/bojivaro.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/13594603651.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/85125355352.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/xofimi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/447383276fb1b8966afb9862cc1678b4/19089790100.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/monipob.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/80e161a80428f40aa7d2da4aa9cd7cee/kedivovesuvo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849c4d9df4a---11012637862.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/93014816610.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/2vca4a49gv7dbp2ok3fgfj8d6n/56491284924.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b591faf7a6---guwatisesivatagive.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/38495866497.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/lozojon.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/63157674567.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jubite.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e99a0b1e27a6991b4941ae52ff75d08d/rezapadezidexiziwewala.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20c1aeaed6---fifage.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tibonuzeg.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2aba328aa8---tosuj.pdfIn PDF document text
    • 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_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 11172 bytes
SHA-256: e5388e5d1bd28ae0c4642f3c361578de6100f3252af8caf596d3d548f16bd3e9
font_01_sfnt_off0000e371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 18200 bytes
SHA-256: f3097d988e7cce43f998b1ff98e8a509a0e7bf1a3434fc814c1fdfd4f104a267
font_02_sfnt_off0001121e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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