Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c39fc159d0a839c…

MALICIOUS

PDF

59.4 KB Created: 2021-09-17 15:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dcba35e81612496c66489ac46a5d4da2 SHA-1: 51182dfe201f74d4191485b821e8ceb5320c2c9b SHA-256: 0c39fc159d0a839ccdc776f416bc79ab08cee41d641a372ee89731d9914d5014
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8660

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studiomanzetti.it/userfiles/files/mirasesazedonosarifozij.pdf In PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/sedmthgjiof8pumc2gace44aj6/77221882268.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/23974047013.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/sisepijetezudolew.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/jakoxakazegodonizu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/57110989968.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/dopajizitumamof.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/19095929320.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/41130411658.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/85919666589.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/lukipegafigawid.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137352079a0d---vekemubizesovenemikuvola.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/18172470680.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/23847677332.pdfIn PDF document text
    • http://atek-ent.com/upload/file/kesoxedak.pdfIn PDF document text
    • http://budka39.ru/files/takasonuwetirabovopovazeg.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16135d74de8b17---xuxabazagugilur.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/xowijuviwipo.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/74488233704.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382a794ab6d---julugewofusabefub.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/pagiza.pdfIn PDF document text
    • http://inica.org/files/file///mifuditativitinexuvavux.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161420ebc35bd8---pasenalanokaxubima.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143470f6bebd---3604969481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+hacker+apk+for+androidPDF 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_off0000c318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC318 16792 bytes
SHA-256: c53bab358b746e9d37d07a4d7c0b536517ca682dc314634ea67a5eb2c59817fc

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