Malicious PDF — malware analysis report

Static analysis result for SHA-256 15138dfbd0c8c427…

MALICIOUS

PDF

76.2 KB Created: 2021-07-19 10:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c2f59d75f06ba70e92eeac9182b35a7 SHA-1: 8cff6f57358867203a88526c37f59dc656b73dd4 SHA-256: 15138dfbd0c8c4274065bd0e652b102f09e73ece55d6d0114aed2f1aa9d47a68
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true destination by using numerous disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7251

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://naturabliskociebie.pl/userfiles/file/21309921054.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3693a02820---jetemo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/nokesipenidaxiwunotabuvut.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/bawibexuwizezize.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/vujex.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/26567750037.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/7388fc05fdbed988aca309da01d2c54d/vuwadi.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tizelewinivikinobeluleg.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/39023234542.pdfIn PDF document text
    • http://namngonviet.com/user-/files/49170599382.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/gekazosulavelizoj.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cd23ae2d345---67083333972.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/xotumalitasonula.pdfIn PDF document text
    • https://dm288.com/slicice/file/dedejokesijodil.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76f54677bf---fasifinofiv.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3711b10d---fuvituxugepigasapajir.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/def45ab9e64a71d10f4bcd33a10b48d5/68351388288.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/616ea0ce0b75356e2b0d1374cd80a92c/54021704127.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50966edc2---3941191501.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7d5dd6e368d846b6bce3711f65d7e76d.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5886405ed8---92822014642.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/575b2b0be70297d1acec484aad19b630/tazaxinoxa.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/vimazatozej.pdfIn PDF document text
    • https://windsbs.biz/files/file/33528897497.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b747127a1f8---lavotejolepotelidaxifobiw.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/jupazixef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=5+rights+of+administrationPDF 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_off000119aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AA 10660 bytes
SHA-256: e177fdd64bc01ef68f3da87e8f74df3b86b77e6b4e990c804133ef837b7006b3