Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcefd9a85bd1e6a…

MALICIOUS

PDF

74.2 KB Created: 2021-10-08 04:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f018a228a7a556531b50166e9ac27f70 SHA-1: 33de0c06770eed391757bc5a276a0e8c96d43346 SHA-256: efcefd9a85bd1e6ae3ae6fdbd996f288a2b8d49d6c9aa80c2483ddbc91b74981
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

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://dokturmice.com/ckfinder/userfiles/files/nutevex.pdf In PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/57112363897.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/50927860151.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/fixirete.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146c0c4235f2---40120695933.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/sawililofegonakuzotifinox.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/93262849935.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kerijisajuvowuf.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/texel.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e26b8a0748---32608687223.pdfIn PDF document text
    • http://upakuika.com/img/file/voverisifexigon.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/49823336142.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/sapasipatipupupesaxuw.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/61552387344.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/gosojufusirugididasod.pdfIn PDF document text
    • https://videoeffect.ir/data/file/taturotoropazodagidizik.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/fatosodolutoto.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/91144afcc0c46291e0aa3d8547aa95f8/xafezolej.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/35217815718.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/gifuwifafuwojugisitafuwad.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/fofuzorazezedozawaveri.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/7611155660.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/766026023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=parts+of+a+butterfly+and+its+functionsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 10824 bytes
SHA-256: 45986d2f674ac8144b31cea66019e8c032df3923bda96c70d2ea367d490d9623

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