Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1bd3a5a4f4326a…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 01:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 128dc48c84925da8c6e6527dac17da19 SHA-1: 3fbd9baa9908758e748dfc88782fa144a2ae9be2 SHA-256: dc1bd3a5a4f4326aab8e76fe1568a40c19bbb1eb7a153a6aea4f1a15aac27bb1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used to host phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8854

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://cataga.de/beta/files/file/wapopubeluroxilada.pdf In PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e2d599db6---rewuzudaxoxawotapav.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/fa607be9dda22d8cf5555e6b965b929e/jevexoremaxopuvupimomunuk.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613e572b23935.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/28448695735.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/migoxotolubesifukato.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/resomerugolivijumovoge.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/dixenutemavijabu.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/saturiniwexexedik.pdfIn PDF document text
    • http://thevalleytrader.com/files/vipegojinulul.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/50949155675.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/sijefokiwizanaso.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/zoretijujikojura.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/58701506799.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/vikizudufozepasurodapez.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16143d71781d0d---90763614199.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/zitomaberasa.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/8181564315.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/vapudesevuguli.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/zozunaj.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/93173889485.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/pogode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=principles+of+macroeconomics+mankiw+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 10864 bytes
SHA-256: eff8d33b51ddacca6cdc30b0afebccbba23d9f5a482649bdf6717b28fd69dd0a
font_01_sfnt_off0000e420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE420 17432 bytes
SHA-256: 48a0665e3777aae2ceb70514c4292ba9c5955a2005e72723d0423aaf90644a0f

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