Malicious PDF — malware analysis report

Static analysis result for SHA-256 90530d50d6cd996e…

MALICIOUS

PDF

62.5 KB Created: 2021-09-07 15:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b43b990e1399f7dbcf3147135bb141b9 SHA-1: 246e2153e1108a695e08219c9e92115d8631af73 SHA-256: 90530d50d6cd996e27495e05530eaa92e0648176ffc7c831597b7b0d6407e1e1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9121

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://chcial.ru/uplcv?utm_term=adobe+livecycle+designer+xml+to+pdf PDF link annotation
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a3710b023bf6b4f2d152633fa6727e16/begukimadavoleku.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/40603284638.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/23f8ce4c010d3e3c87cb4b0afd3d5aac/71106690807.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/risomarevuwodokotopala.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/81499098928.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161025bcb8532b---dukujubonogasoxebezik.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lojabafigope.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/36097509309.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5oqg5cfd85fsoiidh8j7idfnaj/12232918838.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/9e20b73ece8041f9f151975501d46aff/potidukujofe.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/14574188151.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd16565275e---dumudimogifufebe.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kijelulafozabidogudo.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/92622439345.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6ff0374370ba16315edba91b120b709/32968205231.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0589bc73d7---powewum.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d710a24bc---sagud.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/37074337927.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/negujegi.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/56433082006.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609133c98cce2---86411965479.pdfIn PDF document text
    • http://proxima-design.cz/files/file/robedi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f43ad15de9---kodevogasafem.pdfIn PDF document text
    • 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_off0000cc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 17056 bytes
SHA-256: 8236a281e73bd47d55572ef9884fc563b8a7ec127be3cd931634c14760c2494f

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