Malicious PDF — malware analysis report

Static analysis result for SHA-256 afeb4a11560991a0…

MALICIOUS

PDF

81.5 KB Created: 2021-07-04 04:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1929776d58ad0b59176d891b3d853959 SHA-1: 5ee0c70ae361d4b2fcbdaa632d685caf64ee123f SHA-256: afeb4a11560991a0479ebcf32c1213c7eaab71467ea6789f45b740a17b4c6451
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous URLs pointing to compromised websites and link farms, suggesting it's designed to redirect users to malicious content or phishing sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in URLs further support the link farm and potential phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=question+words+exercises+for+kids
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9583a994f582280c77ac2afe6da1ff2e/19252728059.pdf
    • https://alarouba.com/ckfinder/userfiles/files/82774974271.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l3vcdfpttqo7a3u5q3eangorn7/safagoridakijuduxitaxuta.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e2983b76f---fagogipuluxapezikutig.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/negefanosanubosusuferigok.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00f4870206---89299734766.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1cc24ae3---30563443625.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8feb5600780815600728ee7d423ece01/56077396879.pdf
    • http://chayka-svg.ru/files/69689646636.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f9486d4f41f433f24ae19f348b685653/95467856756.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1c597ba4---85849322348.pdf
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/kukirutokutovaminu.pdf
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/sufijijadiziwariduvigesat.pdf
    • https://combrooncom.com/contents//files/voxuxutaviwa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bd70ccea---ribajekabufoguxelib.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/49f293a84fcb94921f380644c31fdae9/wanokebud.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca4370cf2a---forimaterubapojakosezis.pdf
    • http://ablerexthailand.com/userfiles/files/limowem.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c945e80b2---godexaxidozibalanaxawonap.pdf
    • http://lookkorea.net/userfiles/file/6389866400.pdf
    • http://alexlunacoach.com/img/editor/file/dedodelujedesobesun.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/64659b4dc7388813d41654fb2bde4dfa/towed.pdf
    • https://bouveau-consulting.com/userfiles/file/23983197761.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vuird2j9vnnuvnb1hnvgvqieb2/72061594147.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7acd381d---vomaroworevi.pdf
    • 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://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_off0000deb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
font_01_sfnt_off0000f6c7.bin
8566ce2b57fa24011772c18e502ca09456e08ed576f3e14ba8a918863721014d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10700 bytes
font_02_sfnt_off00010faf.bin
ba6a329c8920ed3e849c64795a6345ea5cb93525add2bff630580a11ea47d6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAF 16212 bytes

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