Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4365563f1f4b552…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 18:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2e240fa59b4ae991b034420b0de0c363 SHA-1: 4379863e6f3501cc76b59fbe4faef54f5ab84361 SHA-256: c4365563f1f4b552571658fddba33a6b534a7acdb7884a4c606c313b89ec835c
154 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs, many of which point to compromised WordPress installations and disposable domains. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6611

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/fhuo4klq0f892oih1pkmbq53r6/xizumeweginigodak.pdf In PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086474ed1ee2---84340979174.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/37408472028.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160852c6f588db---31842814982.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/koromulubakamowik.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/tilozafawowirosadijawi.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/92796594459.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612d10bc087d2---zifumigorekirogiki.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/5630322251.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4a92a541f---jitobevuwafifur.pdfIn PDF document text
    • http://northcity.rs/slike/files/pojebasuv.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c5dead2fc2de996fef0e26bb252d2aaf/27204472673.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/65613404067.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608914b97e865---sefejazujorigoluge.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9da86e3699040c1d619f45e441ab617c/20566377281.pdfIn PDF document text
    • https://tomas-music.com/contents//files/jajutiliwexedovusezetol.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/55360142281.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/17033929154.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/91170704496.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/welibal.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/fididu.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/53725369429.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/k63du2e2rve3q7uitoddp24g34/pavudavuzadefamegufufo.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/01ae2b9079ea13a7a17742d1e5da09d1/4523473477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=flow+meter+measurement+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_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 16484 bytes
SHA-256: d22659c1ad5d384b1fca9d1f8f7a241bfa2ffcd37d513d26334f2a21d0fea7e3

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