Malicious PDF — malware analysis report

Static analysis result for SHA-256 7677d21e5863f053…

MALICIOUS

PDF

54.3 KB Created: 2021-06-05 04:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b25a357fba4c0fa3208556daf24c876c SHA-1: a1c0039539bf84dcf8ea24d309d50004f6eccdac SHA-256: 7677d21e5863f053f12686c86c2bfb989615a667677215855c4d92bef5cb661d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a worksheet with answers, a common lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6509

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=solving+linear+equations+fractional+coefficients+worksheet+answers
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f3be1028e---86942546114.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607eadc3bddaf---65494067095.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8eb411463---4963870182.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254564dcff---bajuzevukozotulasuwovuj.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94adcc7edd---67277294115.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/45304539049.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085210a5c765---foxeraxipokefutami.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/d899593861eb799068a8282287c64514/25569873274.pdf
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95737b66b---35306371285.pdf
    • http://cnc-soustruzeni.cz/files/file/15506654330.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7d6e54be8---dajana.pdf
    • http://billsky.ee/files/file/tezori.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/tn565j15qi98s4jatinsjd5rr3/74746603251.pdf
    • http://ahkkpcm.org/userfiles/dugodi.pdf

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