Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da961eb80597b5a…

MALICIOUS

PDF

69.3 KB Created: 2021-05-06 22:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7b8bd554b89cb37a436715df076740b SHA-1: 480d28e5ee528f811a1dbc65d26bee4df7db89ae SHA-256: 3da961eb80597b5a01d6495ace6305768a095a34f0c78c933fd3dc126a4f9e94
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document while hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7986

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i9n2gcn4gq52a66va69cggjcbk/lepemu.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b07c0463---69294954266.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pr8jlhjprmdpo3an36ndon03ir/tofipenosujizujutex.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f64d948be1b3be0272e5b7d7efe98b12/melareguxopozuradovatowu.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e19c9c82fb---vasotefifomumeg.pdf
    • http://hanhthien.net/uploads/file/dexomapisiv.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607424f71b20e---xidid.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d4ed735448fcbd375ffc826eae64bb06/54987277900.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bce47b0e---josuxojuxupekamu.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d19482f98---23370215642.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/555034199aaf51807d24ae49bae2432e/dovuvedogusuvofavugogodep.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d12e8885ceb4db91556a93490eca3daf/jiraku.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16083604c7b385---82434766462.pdf
    • http://www.odnpoznan.pl/fotki/file/file/50264957821.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dosis+l+carnitina+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59f.bin
1afc86da8da1d533cf1ab90cacb24d7dd0795b69edf2e27e8d39b9003aacb93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF59F 5148 bytes

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