Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f664d50b4f233b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-24 10:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7b695b4c4cb9ba92d10198a8389f43c SHA-1: 4c11e705b16018b145ea7c527ca3d549b8e28160 SHA-256: 75f664d50b4f233b90bbe867389e4ed25f7f80757bc89bd825c451868dbd5d73
204 Risk Score

Malware Insights

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

The PDF document employs a social engineering tactic by presenting a lure to install a browser extension or update, which is a common method for distributing malware or stealing credentials. The presence of multiple external URLs, some hosted on potentially compromised or disposable domains, further supports a malicious intent. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious content, likely involving exploitation or the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=tom+clancy%27s+ghost+recon+apk
    • http://eluvial.com/sites/all/sites/eluvial.com/files/matoxojonaxudigaxodot.pdf
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jokubi.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614cea658eb58---gifaxaxegifiw.pdf
    • http://7sate.com/filespath/files/20210914190754.pdf
    • http://www.primariasantana.ro/uploads/file/39402296433.pdf
    • http://www.physedu.in/newsite/userfiles/files/rubapidukekazavuwudezamux.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/guxef.pdf
    • https://villanakarin.com/userfiles/files/rulozuvifujokujireme.pdf
    • http://preprod-proximeo.com/ckfinder/userfiles/files/51754670938.pdf
    • http://lammensfilip.be/uploads/files/nepijakipugoxexin.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/12969424044.pdf
    • https://lotteppta.net/beta/assets/file/xijebamijaja.pdf
    • http://briztravel.com/upload/files/kuretatamodabivofep.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03s47d6022rq123g7h5u5kombg/50829816627.pdf
    • https://miltonmattox.com/userfiles/file/padutoxixagowobu.pdf
    • http://peter-crooks.com/userfiles/file/20365608494.pdf
    • http://stapper.de/sites/default/files/userfilesfile/fasinetemedulidabipixov.pdf
    • https://infosantiere.ro/userfiles/file/64356125082.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132520c96dc8---bukipika.pdf
    • http://thuocnam.xyz/images/files/83712688584.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/22348374099.pdf
    • http://descanso.verareyes.com/ckfinder/userfiles/files/28919536550.pdf
    • https://mcdelandes.ca/uploads/file/jidepes.pdf
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/kigabogozuzovipewibikeg.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/joluvubowo.pdf
    • http://tunglamgarden.com/images/fck/file/40490277232.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_off0000e739.bin
ab77f460c59958425ac6ffaadbb194efe1cde3122a05eca5a93e090ee0a3f26f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10932 bytes
font_01_sfnt_off00010081.bin
9aa5543745c7e45d9267aaa6f5b92f752b3e6a863aad80dd14aff45e62d43897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10081 18008 bytes
font_02_sfnt_off00012f6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6B 16792 bytes

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