Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f978f50ffaf4138…

MALICIOUS

PDF

62.4 KB Created: 2021-05-18 15:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6dcce29a1bbe1f84cffde1c2b00d9b2a SHA-1: 09d137fcdd3bef00ba48ce5f9c619a70eae0dc3c SHA-256: 4f978f50ffaf4138e7e1a31575b6d270412074a6a22d879140a5ab639b8266c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link T1059.007 JavaScript

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging user execution via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9853

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://queure.ru/uplcv?utm_term=prince2+agile+foundation+pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607772e5c2b17---8843263218.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075284781f28---gajajudifixotonuse.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284b691744---solotudoropemezirixebibam.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/mqibdt15la4br3svm8bct2vi8n/48148438896.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/3oj3c37k1qe4dgqkcth9av81u6/radazilodokix.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/347fen1npgi2m3h6rpvdfctnbj/towojasojejat.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/05bf96aed283a8bf5380588a443c0ec5/sakewokudi.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/71c5bd5f244dfda317e32c0ef4490e0b/dofixokemab.pdf
    • http://goteneplast.se/files/images/file/legor.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160823dfef39e4---51331050715.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609845bbdda15---subol.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b9fbbbc4b1b8017b4becb4ad8967a21d/45927692398.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7tvog6a7dpv7pjea8tpj4ctue1/lomivuvekitavurole.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b555ebc739---forufuwenidegosafasodake.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081f30382ea3---39433201426.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/7876d21899a65893829ddd633b8f8cc6/86333770927.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/3mhve1feggpe6jjoucrho48o4g/kosaweluroluzugerok.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-2/20210502185900431520.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_off0000e134.bin
1f02f449b13385d106537ea9684a44b4682e01fb396ffca30c9f9e7d52e89e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 5276 bytes

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