Malicious PDF — malware analysis report

Static analysis result for SHA-256 8397e1545f7759f2…

MALICIOUS

PDF

81.8 KB Created: 2021-06-14 19:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 427f56bae944526fcdd345ac082c87bb SHA-1: edce8fc6baa13ef2647c5a7ee15ecf4f8151399c SHA-256: 8397e1545f7759f2e5354890c10038182b313cd3785d9850ce41d5b45853cf7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9539

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=grade+9+series+and+parallel+circuits+worksheet PDF link annotation
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6b80d04cf20fd5b4a691948cd6c74aa6/pufuzavetutixaluserakono.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/f7ao83hns3gnjfhglumpt7i6fi/batebopurosepuwuj.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/sarukonapigupe.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/62588138710.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/86211484458.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caff4b74c---dafodidazirinok.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/peketunufi.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/zulamelejufojupo.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/43000087361.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c2fe3d30---masaxezikobekugajofoso.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/79722614461.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/65132511dd76031478180f6d9dd8734c/27409518245.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a990b516ecde4f786bc7e75f9e1c6cb7/lodinipafilizabumiki.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/amk7b531gq1utellf65ugckmh3/remowijudadif.pdfIn PDF document text

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