Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8757d7a5f14fc4e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-12 19:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5457a3e867d24fd322f61c7cd5c94f2 SHA-1: 23ab3665724e4643379c74c233ce80d9c1a3a88d SHA-256: f8757d7a5f14fc4ee44ed35771c589017d9dc649a190378a8ef29bf5d1a68868
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5512

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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139abfa7f603---woguzureponese.pdf In PDF document text
    • http://oreade-breche.fr/userfiles/file/1855401320.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/fixukabidu.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/mibivekotaw.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/40291848701.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jodigesikipuderababaw.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab698f83b---94002673204.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210902044913_d1eaik.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vedatobotivubulolinim.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/37589191307.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/70474559003.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/jexizasogi.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/90358352272.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/wabewifikobetuzexabawore.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/35678285073.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/63817036873.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161398678eb1df---kapaguluveminelebe.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8414d34f6---12014315452.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/zazuzanovow.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/1461148909.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/70327630789.pdfIn PDF document text
    • http://electric-kernbichler.at/ritapefujiwimasupi.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jimofa.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/88888909797.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/32563353619.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/togakaboku.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rafexisiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=karl+barth+church+dogmatics+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_off0000df5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5A 11060 bytes
SHA-256: 5554ee6be04379b9234368622a6fc69bc64d134a998cb2fe1ccb2b2767ba60d6

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