Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f83962ae6e6d926…

MALICIOUS

PDF

88.3 KB Created: 2021-07-02 22:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2a57aedfbe15fae82147051a65e220a SHA-1: c0d8648d92003c41d1ffc06c89a023458409822d SHA-256: 9f83962ae6e6d926d5ee6a6270275998488997cb71c035259c49fa31c81af455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or malware distribution. The presence of numerous unknown URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://tischlerei-schlusche.de/sites/default/files/file/rovidejepiledoberigilaxo.pdf
    • http://spreewaldatelier.de/img/editor/file/58719294497.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4ca2936a---bifarolevomenunogamo.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/4oh6956eppmj0bc39d208lg4bl/37958824648.pdf
    • http://rld-carbon.ru/file/32575240386.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd070df86a---pizifivin.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089c38e5586f---zoxoxu.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e1215e2c8ee6a59c8a9050704b8aa403/vazufirisosebafomu.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qvi4jh22345jplkuoj9tnhvnsu/wakilukelepidosug.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8741ff45---gosolu.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/58956401086.pdf
    • http://thermogroup.ru/uploads/files/36206354884.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160712ff481a1c---ponubadeg.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607878842a9a0---rofojegeboveriwekawesew.pdf
    • https://soosekszer.hu/upload/files/lasenego.pdf
    • http://vasvaripalmuzeum.hu/upload/file/lisimabikonudesowadi.pdf
    • http://libertyquad72.fr/userfiles/file/25304579842.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/rmh529j73uf63cb5sujmnmr005/zikuwozike.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4935cff451fdbb5aa8c7eb70a6db15b9/bavezasivumo.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/pne5dd65rqkta5g9s7h3on22j3/mireweroxedekabidafiza.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16098c36fa9038---jafumadazuwaxaves.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fcb4bbf672a2e5cccc49a63729b825c9/14304284557.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7bcee276f2---xukuwosum.pdf
    • https://motelandratecuci.ro/userfiles/file/78836649026.pdf
    • http://mlight.cz/archiv/file/xuzurojizunumikotoju.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdd68ef1bc---kagalonirubuximifodag.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=relations+and+functions+answers
    • 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_off0000f373.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 16792 bytes
font_01_sfnt_off00010b85.bin
32a86e04d4e542da9fe672541f7e9198b217b403171748843b15ef565ddb25cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B85 18232 bytes
font_02_sfnt_off00013b1b.bin
be897453371499e2702c5c5c88fc1997eef57f35473cf6f5cc4ddc71b8840771		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 10700 bytes

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