Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55452503962d16e…

MALICIOUS

PDF

96.0 KB Created: 2021-09-19 17:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8e18e1e7fc16798302d95d1b1d314c8 SHA-1: 37763e9547e7fdade64041194daba961d4929ec8 SHA-256: a55452503962d16e0c43298b0477b78b9b2d44841ea31fef51fa8aad600b3fb1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

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 http://asiancfea.org/userfiles/file/53402936002.pdf In PDF document text
    • https://mimpiindah1.com/contents/files/sovewul.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/81611384563.pdfIn PDF document text
    • http://learningkey.org/userfiles/31240982851.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/xorozuraraxosabofefo.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/40086817163.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/38883807885.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/69051138358.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/donezebokidewarogorij.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/kekejobokazubo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be598885da---pagazasanon.pdfIn PDF document text
    • http://cl-pub.com/files/files/76857969181.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/90791990389.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/28218147328.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0fa4636f---17631890797.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/77002732787.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/rejigimizememewazamed.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/75373965956.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rjkatsasmtom89eu9tnt78navt/49500209514.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109180834063641.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210910155355.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/vinugufawoba.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bipedejanazoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=american+english+file+2+workbook+2nd+edition+teacherPDF link annotation

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