Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4adefd59d0c2f…

MALICIOUS

PDF

65.9 KB Created: 2021-09-05 06:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 11a7a697e61b531028ba0892f26e858e SHA-1: b6065f9a600c8ae20d909f97680a18894654474f SHA-256: fdc4adefd59d0c2f6a303bef860e9278a9b51013f700355d7e359b46efbf31d4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to host malicious content. The PDF's structure and the presence of multiple external URIs indicate an attempt to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d4517ded12c3948f1f0dd7be9786a3d9/lepeke.pdf In PDF document text
    • https://thietkevuphong.com/uploads/image/files/lewajajuvelanexazenube.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/21942020011.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lepuvuvunibutawejajoxesul.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/67034030068.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071a81c92055---luxogasos.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/lv308eq1ea7o7pnsmb1deeeavu/29480288085.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/84605656968.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/84126241020.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/gepezeroxewewu.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/55142295263.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/baxasirezetozijedoki.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/12647944876.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f58d0aa6b---wofoxifelume.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/75448997427.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qm3qdlpv8p0l7uauqpmpvn5knc/91974508344.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f43f8e7326690e43b11606ad5eddc88d/pozowefesalifozubazofe.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/natewe.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/musovovazasiwakesorelusik.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/77320930999.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/620b8c56b8e3943e98a42f63f1fac56a/mijewalo.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/30393484007.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/vavoravub.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/siwudolokenakoz.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076d06d6c259---718504563.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=greensleeves+piano+music+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_off0000dbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFA 10888 bytes
SHA-256: 80a3cfb36e5a38bcd4b43d1ef561eeef559f6757268855dc7a106f5a155efed5