Malicious PDF — malware analysis report

Static analysis result for SHA-256 60cb39443c1e1ea1…

MALICIOUS

PDF

70.9 KB Created: 2021-06-14 13:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d02741cee273b1bd2692cdc1ffa6b99 SHA-1: 6b703a309d6aab411d94d5df3cd27a2515456f4c SHA-256: 60cb39443c1e1ea1ea9645fa251925ed4d211e6c4fb5b30c0c38f160958c2b46
154 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or conducting phishing. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8161

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://cructi.ru/uplcv?utm_term=factorio+7+to+4+balancer
    • https://alarrabnews.com/images/content/content/file/sumotikazixatemataviluki.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607811c9743e0---kimoziribotani.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607287b4e958c---48413129718.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d576f19b---pepelutuxakanivum.pdf
    • https://alutat.com/data/file/1257609476.pdf
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/jowogupufevutowojaze.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb43b6d0e---pudoxiwi.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/500bc4342e5595a604520b0b934739fd/99366090702.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c5882099a---maxofujoxitu.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/1da54c38e4047dbe5ff4885f3a3e1231/vifipawoki.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8edf9de26ac3fbd5f5a259a26fab0ac/ruxewupixereteto.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2ff9eb65131003e468c623c6849288dd/ruketutopag.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_off00010ac6.bin
b3e29b4427bffe5eb080e765b7dacabf9b08d597a6f482722ef8da229ad426f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC6 4876 bytes

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