Malicious PDF — malware analysis report

Static analysis result for SHA-256 f780f564d07cd594…

MALICIOUS

PDF

72.1 KB Created: 2021-06-11 04:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 215d500e3bef9ef24e79369eb88d5a0e SHA-1: db0613ec367a5e09c4f10747a8bd3fc2716f2d8b SHA-256: f780f564d07cd5942fda0e0100e973e3edc6db3ad0b27bd0115527ca82b16d80
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 WordPress sites. The document body, though partially corrupted, suggests a lure related to downloading a "hack" for Subway Surfers, indicating a phishing or scam attempt. The presence of multiple external URIs and the ML classifier flagging it as malicious strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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://crysiq.ru/uplcv?utm_term=subway+surfers+hack+apk+unlimited+coins+and+keys+download PDF link annotation
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf543be270---vasejazav.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/130daf7f47bce40bfc35b73b99ca978d/dobegelibisododenuxik.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1dbeb6b5a---11367173949.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6364d6bbc---65114836023.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073eacb01108---30808038008.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/kesofevirum.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/94346926892.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d69e4e31---85577865509.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76b6ab3f83---sunur.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd6d1d3ae2---94674812959.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/51686496443.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/wufulikokikas.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/j491cue8d3sf7vags98tbj5etf/lojiwunigixovur.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762856d76d8---53145850824.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/zufotanaxunegepado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 5896 bytes
SHA-256: da6ff089ff69631df24612c7e006c2aed64dedc49df64c89c741af33063455d9

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