Malicious PDF — malware analysis report

Static analysis result for SHA-256 867ed38b021ea257…

MALICIOUS

PDF

69.5 KB Created: 2021-05-09 23:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27d5ccfdbb81744c25c285bd5ba119d4 SHA-1: 82eeb18bff7521abba61907d753e909c9b2b0645 SHA-256: 867ed38b021ea257d133ba24b6f2da3237e4aa791ee283443c05136b736555a9
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, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document is designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8239

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://krisoc.ru/uplcv?utm_term=apc+netshelter+visio+stencil
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/23kni14tkhk6qf7750un4og2kk/kedadakunokusejazo.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c40c7f2f7---62946223237.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090cf321a78b---96172410450.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/79c816915977cd5ef2230c3e3b51189a/29479656315.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c50a31f61b3edfe18cc493b2a8a9fdf4/bafaxeroxano.pdf
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6a665bbe78588918fa1ad1426688244e/mironutirokalujip.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160764cb922cc2---karuno.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075925f442d3---buwedixofifojej.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/529793db96af3913865dc31f813db860/42803127196.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075f4ae510---62917903386.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d171f0d8fd43417808b9a87e5603ffcf/59389435543.pdf
    • http://syuncyoku.jp/upload/file/wonabamozosevewe.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c4974da8---jokaxasifuti.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9bbf1fa0---757135436.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16072583b74670---44254452859.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085d0cc5f98c---kigelixuvajojufibev.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_off0000efef.bin
eeb1acf694a2bab6b546fac54d06def2e8b374f8572365040662b8000d59c9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 4860 bytes

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