Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68f6a0818ae6c28…

MALICIOUS

PDF

47.6 KB Created: 2021-06-10 23:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a5f57a47d46ebca1cbe5ef0cf3a736c6 SHA-1: 57425573a62e26b6a356f5c6885b5c2a8a491902 SHA-256: c68f6a0818ae6c2844e22eb66d39ff6620c66f3b1d4e45d76df4677259ed6a34
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malware. The heuristic firings indicate the PDF is designed as a link farm on disposable hosting, with one URL specifically mentioning a Windows 10 ISO download. Although no scripts were extracted, the PDF structure and URL patterns are strongly indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7169

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://medvor.ru/uplcv?utm_term=windows+10+32bit+iso+google+drive PDF link annotation
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/a99rmi2mo6tkg7l3umh8pgjd32/zinokegelo.pdfIn PDF document text
    • http://didopack.com/files/25683721187.pdfIn PDF document text
    • https://beaszemin.com/files/kifajabafatimelikiz.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16222529733396.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/bpu3ec2ier7hhn7liufp84bllr/41197996810.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff27687486---78534487681.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd4a5c6048d6e9fd730cdd1067ee4725/rujesabokuvib.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f8a34242---50211987551.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160822f84879ce---dutesadofewigo.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/motugirezesekak.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/79696200905.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/fn9fg47lg57irk4pjocp6elqun/43662923354.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/13562b921235e50ce03d254e08c277ac/27618295273.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/96796824704.pdfIn PDF document text

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