Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a624d79fba4b345…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 04:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b041b184bc1bdd19a3914e65873eaef3 SHA-1: 5ee8f67283e46785e8f7d501f776b414b3b793cf SHA-256: 4a624d79fba4b345033af716e29c7655181fe54358c6fb1d7eeee51b87c7ef06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lead users to phishing pages or download further malicious content. The presence of these links and the overall structure strongly suggest a malicious intent to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://catamma.ru/uplcv?utm_term=fury+prot+rotation+wow+classic PDF link annotation
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051022052_158612035.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8325b1577---vipilubukalowo.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/0f137e60f2737777aa9ac67c4a101182/26103722417.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/234fa78b61764d6720e5dbf8da2c9d1b/nozubidodonulikitulupat.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc7c916e5---baxuwakafosodiz.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836eb4ed05b---82321479423.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160881b6859d12---86926293736.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8085f75304fb1f8ae7c9b46279a7a10a/28129532667.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/gobiniweg.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4f4c8d4ab19ec62dc815bca65e3ddf99/34590808875.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/700e2d14c764f437648f145c32175f1a/66664950796.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/57343346052.pdfIn PDF document text
    • http://rosycaffe.com/file/mepomixiwevobofegagudej.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa3dd8dd88---11899378862.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160745f276ca15---gaketagubotilegeke.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f00b2e523---45205277099.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f424821093---zajozipupejirumobu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce7fe1c519---91569595643.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/bufebibadageg.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/duzukukutidezinotolav.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089efa160066---motanawu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tifogafela.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58bbb68da3---48774744222.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/15772761657.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607823e47c60c---69465202126.pdfIn 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_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 10512 bytes
SHA-256: 40ffbb7805222db344620e1190349ef6db4f32befc3665e8d510a8b43e627e24
font_02_sfnt_off00014f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F5E 17108 bytes
SHA-256: bd364b909741957d40b8fc9a9ab287f7aed75f5fb2194dacd96aecb45ae226cd

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