Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f820f54f02eb70…

MALICIOUS

PDF

54.2 KB Created: 2021-06-12 18:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f4f3591046b1e16fdf2bf0a3d4961c4 SHA-1: 48a38704ff009ef16e6853a1022bbd008fe84fb8 SHA-256: b8f820f54f02eb709782bbdb6d066b42c1e6101e34e772dd5a0cdfb99d456e1c
154 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. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF indicate a deliberate attempt to host malicious content on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8747

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://archism.ru/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+4+road+to+boruto+mods
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160824759cabbd---78639303354.pdf
    • http://agiusfuneraldirectors.com/files/file/xiwevuwa.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88935313e---kesofisukisikevebelofuw.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c831b68a1e0f98e77dfaeb30f1dd84de/74032737097.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7c762689e---57938724071.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f6ba9defb738cd6e21a72360d4c7e3dc/28196139374.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/d62b688eb67655002a68a5f8fd365ca4/fasejaz.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9594b52f---giregedutelilekixoz.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/99496e63543679749d0bbed4cd7cc5cb/lasanalovenepowi.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607b844abe3ef---sidunozepuvubakol.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/ce73bca0858eded541356eeb05a5f1fb/dasurawevaweromomifi.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671398f70e---68554166062.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fq4kqmbdulrn4mc16npalostvd/pesadimukibodafaliw.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/warerokeze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caca.bin
9c677040f1f5147ba9d7e891bbd89798bfc26378ed125f42fcd5042597d28006		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 5472 bytes

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