Malicious PDF — malware analysis report

Static analysis result for SHA-256 c63da0642be4176c…

MALICIOUS

PDF

79.8 KB Created: 2021-06-14 06:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00a6d08ddbf5b240993d17a450ecc618 SHA-1: 32d16c2a282763b87f422c8b6a8e1575f9a8378d SHA-256: c63da0642be4176c9bb6ebe4d53671cee726555503e666b98e1a4bfcd3fa347a
204 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, indicating a high likelihood of malicious intent. The document employs social engineering by presenting a lure related to 'volume booster for windows 10' and instructing the user to install a browser extension or update, which is a common tactic for malware delivery. Numerous URLs are embedded, many pointing to compromised CMS uploads or disposable hosting, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=best+volume+booster+for+windows+10
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/mufira.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d7802be4---28407668858.pdf
    • http://bindashnews.com/userfiles/file/lobim.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5da28d2065---71938890473.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc53b3c75d---lopimupobuvoki.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/mlr1t9b628mqdurau1vfr72ff3/37259602236.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cf786150f---69672741108.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adf0b1d1602---gatupovumitiputerude.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1917246530---sizeno.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607547dc9e54b---zediva.pdf
    • http://sun-eko.eu/files/file/zupiraranuru.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/2655119932.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/mavexajepunadejejipuvu.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7d951eaff---70595397653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000f9de.bin
9cf9a06fcd8682bd69beffe0243a0e6d5242ac1e1de8db035abe9997a65a2b91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DE 5376 bytes
font_01_sfnt_off00010c31.bin
d5b8a5d078cdb2a925cdce95759cbba52c5bacb664f61b4272ce071c5a0697b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 11248 bytes

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