Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b865cbadba504b7…

MALICIOUS

PDF

67.8 KB Created: 2021-09-17 17:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: b5b5196e7dc6af3c86a905b3551e4b48 SHA-1: ecef42e47e910432ae4d07af86f85d30e5486e83 SHA-256: 6b865cbadba504b78cc54779edad51048fb62b7708aee5b99f8bcaf4fc595b65
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6574

Heuristics 6

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=cheat+in+roblox+2021 PDF link annotation
    • http://nmways.com/uploads/fckupload/file/fajezasedenukinufumagun.pdfIn PDF document text
    • https://tpk-m.ru/files/file/degenu.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/mikinexededanijazerisamig.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/41242713915.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309077ed075---22219154840.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8709f92a---62917466405.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/latibekenobudazidoxarimi.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/xuguzepudakajize.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161418042d3ae2---lepogalagalujaxaw.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/kedixobotuza.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/nelerepofuvufadaw.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/20393389035.pdfIn PDF document text
    • http://calisnt.com/uploads/files/zutunenavavixevuruxarek.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a3368329cc53a81c294926b3027900f3/91669576584.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/motigakalajix.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/wexidupuxeg.pdfIn PDF document text
    • http://hongdacable.com/d/files/70725501253.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/jefikubupavowizamabofor.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/33002011596.pdfIn PDF document text
    • 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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 17164 bytes
SHA-256: a7ba94fd98e7ca35d4259138ea5fd7479e425c96d69a3d756be92dc4c46d8f12
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 10604 bytes
SHA-256: 61c946b3e358f35ec8c318642b6fea3b72a487f173383d7b4439f4c50bc2fee8

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