Malicious PDF — malware analysis report

Static analysis result for SHA-256 816814bfa2cbbb59…

MALICIOUS

PDF

48.0 KB Created: 2021-06-20 12:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1657d551edfca273ac208de9b3d2cdde SHA-1: 3046178cc4443dd15f14cd8a64df0f16c43e7319 SHA-256: 816814bfa2cbbb59373b08327c4ab5003ee60596320964570d475d84441d51dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a fake Minecraft version. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7248

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://nomylo.ru/uplcv?utm_term=download+minecraft+versi+0.14 PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/f168d7676bdb78e6b97324f1d35106bc/lanuduvulade.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e62479d85---notanevisul.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e98e3e31085aeaa2af7d2b039db65d48/67442170216.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106171106109123.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e2a25156c---71824637957.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bb889b9c---sinigifizulafozamo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/936add6e101fc46bc1875b35c4a3a061/66370344668.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v7i8vsk28ulndlq9l0e22ghpd3/bebibebirikojudeze.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/39058532203.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fe90211688d7c46f4c89c7f11f8c5d1/65997501784.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9bae1ab9e---78375515770.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/64039556070.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c299fc34f42---fozidividorarafovexa.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/b8f7610351d0b72f3c7ec3ab02cf96ce/nijunokiki.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/weded.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/01836e6af47a21abff4d7c8c1015c4c3/jejunol.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd932f6d97d---deparuxidosuxeruribid.pdfIn PDF document text

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