Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b7889428a73d18…

MALICIOUS

PDF

46.9 KB Created: 2021-09-27 15:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 94d684a645d7c994cac37bbca0900486 SHA-1: 8947f82a5bf509876aa98526aff9461c6f8383e4 SHA-256: 65b7889428a73d18fe7e4c26a3b22ef94855cbb223fa22dc44c4d74753016458
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7332

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 http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/25584910410.pdf In PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140959691abc---fisugiwolalegiv.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/narevagagere.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/76788589049.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/vizikelanidobapuxuron.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df3a38c137---disugivotowefam.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/kitawewikagakigafaduduzaf.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/70075116789.pdfIn PDF document text
    • https://synersys.fr/contenu/file/dobogixufelenokofi.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/64857986841.pdfIn PDF document text
    • http://air-con.ru/upload/files/tufufuburujekaduwapesove.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/zopujosuwetozozimokuwaw.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/77091920938.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/787f429cc830cdca60c39e963fffac3d/zakir.pdfIn PDF document text
    • https://kawanmto.com/contents/files/gesotejitigeguseta.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/6567699870.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/87567742753.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/9400966687.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210911153516.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613be1d0104a4---xibaxomonibo.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xasimejosomonob.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f12ac38825---51971630759.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/gonesudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=signs+of+malware+on+androidPDF link annotation

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