Malicious PDF — malware analysis report

Static analysis result for SHA-256 39688a0abb3082e1…

MALICIOUS

PDF

69.5 KB Created: 2021-05-18 05:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c690d542eccc163ec774c1bfe00a6064 SHA-1: 11c7fd8e8d568ac5a43986ba24c950c034b05ed0 SHA-256: 39688a0abb3082e19c3d6aff198a4961d4b4db8e4abefce10978aaabfbe05bb2
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. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and potentially disposable hosting, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8336

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://huntic.ru/uplcv?utm_term=how+to+find+class+id+for+turnitin
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f9b6e867775662da11946dc8cf77ce8c/95038810846.pdf
    • http://dok-vo.ru/userfiles/file/watupeseson.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607576424060e---tidemawixerigaroxo.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/toch4n7rdu0p3sbb3qf87dtj1q/70582847195.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099de058df69---98738740614.pdf
    • http://au-coeur-du-temps.com/userfiles/file/62133026367.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1ed9vqlnr0ug07src5vpktie7/bugin.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcb7035e51---69613611612.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2776ec76aabd84ee4726627c2d4448fa/muzebisumeluj.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced49b5f22---49370013055.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075359bd6757---vewoxo.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/343fa20eacdb57328ca282b723a38367/vasiwokubawupadapibonajo.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tth45k0kjh0aodkot9bk24sl67/bunijal.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077eb53d0ef4---kelawuvenadezodadenub.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5ab30e3014e816df2448bcaa9846e7a5/89486472921.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1306b4b5---99924185344.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/eodicldd4ff7gjmjucamik305v/fisomosusotikujefaxusewi.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_off0000e691.bin
51647ed810558db8835f5757991bbf9d559f3d2eb6d53eed838a6329bb41d87f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE691 5068 bytes

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