Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ae0e673c60e7f1…

MALICIOUS

PDF

96.0 KB Created: 2021-10-05 00:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 735e2d2108abd501100d8d2f86a18119 SHA-1: b609f3e9c78ca8f8a6b1f10c808938520882b96d SHA-256: f4ae0e673c60e7f1dec8122803d3fe6497ce3c54ec4e82d378d83e2587e384c7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features numerous external URLs, including links to compromised WordPress upload storage, suggesting a phishing or credential harvesting attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6684

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=analog+integrated+circuit+design+solutions+manual PDF link annotation
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8f4e2120b---61840077167.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/13115363192.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/fuxinepexavubutulamufu.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/47559714765.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/mokuvezajatamitovik.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1615b7191cb2bd---60235396964.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/93589679071.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d19e66b91cfd94cd8e4b77eafeda0e62/73581346030.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/2280839513.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/rexaferovunawoverujeb.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/67858228291.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/rababan.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/19452038306.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/sanoranimez.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/fadedonujod.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161510726af76f---jetusenujeduwu.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/midubogosumiga.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/64741248727.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dddd910c446b66a345e7a91ae03c6ae9/vavivesiz.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/xatategekivoxafa.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/31692800169.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/nafatir.pdfIn PDF document text

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