Malicious PDF — malware analysis report

Static analysis result for SHA-256 e427e814953ec8bb…

MALICIOUS

PDF

61.6 KB Created: 2021-09-18 15:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d44f315d459bbf76a1a36b4c173c9721 SHA-1: 06b18ffeb07c0f9acbefa1964f00334851e23a95 SHA-256: e427e814953ec8bb7b4fec5157ab599217046dca1f3a4d007d71d3b63a527bd5
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs, particularly those related to 'counter strike game download', indicate a social engineering pretext to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8187

Heuristics 5

  • 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.
  • 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://dichvumucin.com/upload/ckupload/files/kegusanerogatomefunuleme.pdf In PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/luzoxowekosebogudidege.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/96465396768.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/vakefebakevebovo.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7983329d---81765301896.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/48893039752.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210908_DA9D99A08054B226.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/zifulomuwijuxapotim.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/topazunumatesazun.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c1873025---vowokonava.pdfIn PDF document text
    • http://ymmicro.com/files/files/metulivo.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141f06bef92d---59182497269.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/80927459536.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/35995509173.pdfIn PDF document text
    • http://unityproductions.com/upload/files/tojeko.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/04083f2440465454367c14c110c56abd/93641049094.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/74018462832.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/kewomepube.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/23641722675.pdfIn PDF document text
    • http://sinostandards.net/upload/files/6645225677.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dumewifemugukig.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/27699743079.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/53800061639.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/zafunudowakawamogesese.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/wifuvimasabijekupukuxojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=counter+strike+game+download+for+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1