Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c759646d53fb8c9…

MALICIOUS

PDF

62.0 KB Created: 2021-07-31 07:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 913d5db7028e96bd462a9eced045cce8 SHA-1: 4ea4ddd225bbeca2a4b96b43b8043e5ab50cf78d SHA-256: 9c759646d53fb8c9c079d2e0c75a22bada7e538d544f2e7ce1c2dfb77f7ef6b7
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns indicate a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8746

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kursadowicz.pl/Upload/file/37857301392.pdf In PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd39f0368---26675824779.pdfIn PDF document text
    • https://amblamy.ee/upload/file/34934727479.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c02c7960---10129381184.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/56577445571.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae8158f9a8---lufipotomufu.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48f490882---jibozebapuzetakitedodaxi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f090d83ac---39764266566.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/jibuxoxemewuw.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/nezutakij.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/11136335026.pdfIn PDF document text
    • http://arslanemlak.come/file/bomad.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/xulil.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/53001956544.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4399e09c01.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3a6c6c6e04c9a02beadca0f6b8867349/89177346792.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/26926027971.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/6380971615.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/10567530838.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/76527469246.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160792f68033b6---11123341221.pdfIn PDF document text
    • https://masihpt2.com/contents//files/24056279268.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/zubepojaxivizujaxuguxizaf.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/59885447186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=peliculas+completas+en+espa%C3%B1ol+latino+de+bandanPDF 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_off0000cc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5C 11024 bytes
SHA-256: c2f1e436de8351f8ad6fb1a07fbd764fc6d965c14153bfcd8cf23a086d2c8d03

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