Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11b87d6d665bb02…

MALICIOUS

PDF

68.1 KB Created: 2021-06-05 03:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 378d85779e93c3d421ee41aab42599cc SHA-1: 32e44ae302306f0a4e675021e7a8fe7ab32e828f SHA-256: d11b87d6d665bb02ff41fa57790fe3fc7219e1ebd68ff2fe87e97e22dcd2bc21
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded content, though heavily obfuscated, appears to be part of a scheme to redirect users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://crewmak.ru/uplcv?utm_term=how+to+get+waluigi+in+super+smash+flash+2
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/cmlj606e6debehnlvvttav0rhg/dizewu.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/00b35cdd23496b23cd50e67d0bae7d32/nexorefenarokanud.pdf
    • http://dtcguild.org/clients/80367/File/44002542966.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6089771e98---72511517954.pdf
    • https://motelandratecuci.ro/userfiles/file/vinutaniwen.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160973103b8b8f---gebid.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/38isqlv3g9pp1bhdrub54l1qm4/nifazezixozaw.pdf
    • http://refta-bg.com/userfiles/file/xokemesuxavasefagibon.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608679f552b6a---40050234418.pdf
    • http://fritz-fahrlaender.ch/download/tuxilurifatowojomeluk.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/26ba420070b893628d0e62173d0b06d7/73784058292.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094c909a6218---19084943638.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609926ffdac56---basofexega.pdf
    • https://veterinarycarefoundation.org/userfiles/file/47737452848.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757d642a133---ravumuzamawi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd6a.bin
2dbb6a0ef4491fba84edbf827f60ed55131aace919dcf9fe8867e0abd7bae732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 5384 bytes
font_01_sfnt_off0000efa1.bin
c6521a2f06bbda4c7122ba7fe5ef716a059ffb3a37b59def97da38c362daddb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10972 bytes

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