Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a61e32c4f376bee…

MALICIOUS

PDF

93.2 KB Created: 2021-09-02 18:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f4a58ea84c3031c37582e20f6b365315 SHA-1: 9b95fa57095e0842d0f2b3d4f6d68eea545ec06b SHA-256: 2a61e32c4f376beeaff62fa5ae4f67c92cc7609a1f8c4b04bd1ba218833ecf79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable domains, suggesting it is part of a link farm used for phishing or spam. No scripts were extracted from this sample, but the extensive use of external links indicates a likely attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nomylo.ru/uplcv?utm_term=klaviernoten+anf%C3%A4nger+erwachsene+pdf PDF link annotation
    • http://akinmedical.com/uploads/file/81832713653.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/fegizabanok.pdfIn PDF document text
    • http://stringladies.cz/userfiles/46806117683.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ff92a4da---78934387181.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610289db8a008---poperirasikeluta.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/35054563283.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ce850f089b1261a51ba85a8e324ad19c/30207155773.pdfIn PDF document text
    • http://bronia.org/userfiles/file/dovawogalis.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/edr5l3m6da49drnqbidqvpfpbt/bifugozo.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/roluwezojudizemovupuda.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/gobovibumudukoruvevuge.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/85443232299.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/10510226992.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160977033956cf---84136277458.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d479c064c---funapotopixoxonajujuvu.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/56460648779f4e193a489a449f5ec588/52565894405.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e6392bdbbc83a66e0014c0574979640a/54440096941.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/88272505963.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/cfii5f6du38sre94da6d6ltton/vider.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/kazuragonuluvabinavek.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/56784838267.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/98361399599.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/25617603381.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pofisef.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/55511760047.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a9a39c40---faxizomigesatatepubi.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_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 11296 bytes
SHA-256: 6857d92ec7ee0cec848c45391ea73538bc88e4eb01cfcd0b2fa640c223563fcd
font_01_sfnt_off00011577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11577 21884 bytes
SHA-256: 185ae3c2ac1533d03a5c746fb2222783491887252f39b8692e421aec0d68de36
font_02_sfnt_off00014c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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