Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c827352e2fedbd…

MALICIOUS

PDF

79.0 KB Created: 2021-07-19 20:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1467998cdecb8e858ed6a688999e67be SHA-1: 938186a82d6c4f0ee0b0c48be7813accaab11595 SHA-256: 80c827352e2fedbd92cc75a6f567515bc7cc22e3b5f440996f8cddb372ed1996
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific intent beyond the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8489

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1t28qeifl0v172o1oc7v1rmf9j/5802051046.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/3d992716bfa0e93cc53fe9705bb7a712/lojawatu.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/jaxepixalexamesululegeni.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/delibanuxiwofetopavivoxat.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/25/vodamosavarewe.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/3ac2027aecd04dcb64df4edaa49f52cf/rijananuwedes.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/82150421006.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/waposijutubokapigifafito.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e812cc47424---62231873319.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be4d9b6e959---paxawanitu.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/p6c1tu315iik8ano3enmcm6go3/35915989448.pdfIn PDF document text
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/pejolibilegebudetafebi.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/zewafobolatitupakub.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ce6a3945ccb02822ceb234b1e3294b2a/tutilowisopesorexakuwupu.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/716995288.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/814bca174c68ac9ffc475edd85d0b2a6/95330172179.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/8833878859.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/16673205983.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e2260f4d6---51768689866.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/90376520629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=functional+dairy+products+pdfPDF 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_off000114ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AB 17740 bytes
SHA-256: 16737b681a4ca78495ab9dd5c3ae0462de7f5e6e6e608670c3e064ad79c1437a

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