Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aeff918bbbdd9e…

MALICIOUS

PDF

58.0 KB Created: 2021-05-29 18:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ffe065d623802294feaf088d763f3b8 SHA-1: 8f6e3685ee4ff07ad4ded94dcbd88d10b673434b SHA-256: 15aeff918bbbdd9ea7185c7d4259f3f06debafdac4472f45d8a3b1f16e38b2f4
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8022

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8vb7l2e1mbas5kftaeafanacm0/38399656141.pdf
    • http://hanarotalk.com/userfiles/file/%5C/30338384286.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a542d89b23a2664b36ac2d235ed2627b/depupuwiboxov.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/38443821549.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/320864c61e72da012516ef4cd360d787/nakazesede.pdf
    • http://bendhorseride.com/userfiles/file/95246494899.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f492e254---gimotusesuzigakedikit.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/536ca8d2eae4f98e23b577f2102e900f/bululatumiban.pdf
    • http://driver-jazda.pl/upload/file/zeliteboxerofeka.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a678d389928---96709781907.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/42ba55f8750d836cadd7bb52e16babce/mivilikugenef.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/bncktml7ivh9se7s50c77d214j/wekezuzilela.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16083a291492d0---gemefadopinolewasixe.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099184193c58---43651476093.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihgk771s9op2cnlf44ur73k206/39886070139.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072093f4840a---77061720257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+setup+calamity+terraria
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1e.bin
b2e2b442b677a60679dcb2acf775fbe322a303445410aab53f90618ccf857bd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 5232 bytes

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