Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a103c4655062e9…

MALICIOUS

PDF

64.0 KB Created: 2021-06-05 03:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca4ce1ed2e2b5e7f107caa5509a42f93 SHA-1: 971d78c9a9f0e3b5cf8dfa87c49158565041d03f SHA-256: 64a103c4655062e9d77b77699317a43a90aa733459e84c089de019b7002cbed6
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The document body, though heavily obfuscated, contains references to URLs and potentially search terms, suggesting a phishing or link-farming lure. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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 1

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

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