Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc591db781191f4…

MALICIOUS

PDF

74.4 KB Created: 2021-06-21 17:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6097e69b58a4c44385fd23bd59f6c81 SHA-1: d648b4352df259fcfdf495dbd1b8ed2dffb879e5 SHA-256: 9fc591db781191f49d4c11338e94b7474a84ac9536da2b23db3395c52cfaa3b4
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the nature of the heuristics suggest this PDF is part of a link farm designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/j178sbn7sjuqikdonf8j219mp7/63820726899.pdf
    • https://aravlicraft.com/cmsCart//upload/file/16874719510.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607591ba12243---busenubomosiwobimofadidi.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4313b1f36---vosafovizuxejupabisasales.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kkpjtqpdb163tcpanu018q24s/sinoduxapud.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/75u7m9ka0vapsa6v8snaokshth/zifodejavabol.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607436e7341a3---76120788498.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/63cfcbfe9b909454a3471c77cc4a3b46/4424051405.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b982765f5---20473330932.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b440a2b9b88---42393755284.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/dfb01bf4d4c94304a267bceb38acf1c7/47535545717.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af75a3c6bc---kijezopoweguze.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/s4eap0iek730mhh2t2pjjq3s56/jokukufuzijiragapijexov.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/girixududozezozo.pdf
    • http://mdsalon.ru/img/lib/file/97394516270.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd42c8be9b7---73023973553.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f2f0f756---55904958007.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hydrogen+chapter+class+11+notes+pdf+download
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1d4.bin
130a9610ae1b13e9de9f29689553e9cf36fa3af3781e105f1b2bbbf5f82aef4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 5624 bytes
font_01_sfnt_off0000f50f.bin
480302c06bf2005d8612ecab75c9f5579655afb1d12130577771a020da3eb725
pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 11392 bytes