Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eae784e7bf0d15b…

MALICIOUS

PDF

51.6 KB Created: 2021-05-27 16:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0ebf04ee4cf5e5fbbaa1ac230728e0a SHA-1: 61e7227717761d0b5d0cc1828b034279e98a7119 SHA-256: 4eae784e7bf0d15bba802855c93b3ee1a1be11b1754723b50a73fbd56a76fabd
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure, likely intended to trick users into clicking a link disguised as content related to "Puzzles and survival codes". The document is image-only, a common tactic to hide clickable elements. Multiple URLs were extracted, many pointing to compromised WordPress sites, suggesting a campaign distributing malicious PDFs. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7590

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 51 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://krisoc.ru/uplcv?utm_term=puzzles+and+survival+codes+april+2021
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/c389a413954f58f1ee4a492db3eb08b6/73087473266.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/32g1fpe37m11959ps42nlsecl2/natuju.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf598d3c20---91364895447.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7ea75176---navad.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729729b687e---63948153459.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774ef557bd6---54073248489.pdf
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d00b7abe4---20570727493.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0e7dacebe---tekesir.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9f21f95b0e1e7d27f31dfc341c8b77a6/gomakilelodefexuwipe.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2bde5f3bf3bd298c5fa4697dd84f07fd/53082468649.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef8380bc9---pezotinisanolik.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3675293d7---vawafaselikonaga.pdf
    • http://soles2walk.cz/data/file/73760842231.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/65f97ed37b51439c19a31441b266ff17/vulesaxuzotubiguxokuneb.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l2gdfkqvhdo1vgajklf2dlchsj/77357554916.pdf

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