Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc693bb4b1715f35…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 01:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac6bbf0c8f71e2e28eddd0a54d4e7b6f SHA-1: 0976895c84645f4e3e59730e4a1b347ac545e7a1 SHA-256: fc693bb4b1715f35990f2e4c0cc4f2fa16a268d340a99d394f3594656cc5fef2
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The file functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious external sites.

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 https://chcial.ru/uplcv?utm_term=dryland+workouts+for+butterfly+swimmers
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/51874534098.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bec434453ba---mabid.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wobevabupobelepolopumafor.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a349cd53402---51158039460.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tc5u9ii7s5mj9s4boacg30la5q/pujal.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d3f78b03---95575860594.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/371ae62fd0d862b51ca173d2dc197352/tigoregalujis.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd6a4622c23cb790aac7a02da9fbd36d/97834817825.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6525547f08---55481295341.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f996a61b2fd3af47cf1193db15d6c067/losirazexodaxov.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160befdf874e8c---temul.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d65187e1121---kenenifitupanos.pdf
    • http://alliusie.com/userfiles/file/lapek.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a949275ed6825f3d7cb594b128cbd08e/7809293500.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c777b7b45ebe9a09284184620b874a14/47959073232.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e46802d44c3ec0ed9877ee8e0d902d5e/37822000700.pdf
    • https://divinenine.net/userfiles/file/52028889080.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/1518f5e064368efd276aca3327b60b12/55987684553.pdf
    • http://ankamet.com/userfiles/file/88084488274.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f62156c12d41d89b8e9e2ca05442caa/kuduxavazuxofubiroramob.pdf
    • http://reclameindex.nl/images/uploads/33606317861.pdf
    • http://kapli74.ru/upload_picture/bapaxorazarisijofelip.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160724313d9503---63947376615.pdf
    • https://communeouchamps.fr/userfiles/file/xolarev.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca01042d20f---bibasazewuv.pdf
    • https://locoffice.ru/userfiles/file/losowotanikoze.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_off000101b1.bin
4e19bef5282934b725f40b10616ca65157bb129f285b5b20e3c7bf8c6d72092c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 16304 bytes
font_01_sfnt_off00012c04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 16792 bytes
font_02_sfnt_off0001441b.bin
a3b3361ac9c5bd66f8d2ca289100afa66823f5a3e155ed27249e8e2cf7544c01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1441B 11048 bytes

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