Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db8d035ca7ff875…

MALICIOUS

PDF

177.8 KB Created: 2021-08-19 15:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 28927e250e9c0bcdde03e3af06dc620e SHA-1: ce347b07d1ecf3a0a8d2e6eb1eb5174cb4b01f67 SHA-256: 0db8d035ca7ff87557318a5aeda0a3218d8041b9b97a35521764fb26d61a890b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress sites and disposable hosting. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6668

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 http://driver-jazda.pl/upload/file/6286328943.pdf
    • https://acrgroup.nl/userfiles/file/datidepo.pdf
    • https://tonwen.org/userfiles/file/tizexebegujizefane.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8762d5df---96267725818.pdf
    • http://factory-01.com/js/upload/files/98638282546.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a91df2d71---47490303982.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f196736382d90aa0c4828591fd555387/35096653476.pdf
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/dejomekajufosanariguxojaw.pdf
    • http://dsraxys.com/uploads/masigisevimatifa.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f94fac5be---5273147195.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738c5733137---50457890447.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb1403f207---dekalagukunimumalogegu.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/53836485078.pdf
    • https://csn-alliance.com/data/files/bewimuwimufukalikati.pdf
    • http://szpk.hu/_user/file/37696523263.pdf
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdf
    • http://owv-sad.de/userfiles/files/demorozizoko.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/4384ef7acee4ae92150121d36b6ad675/67030391963.pdf
    • http://floralojistik.com/userfiles/file/18097924586.pdf
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58124912480.pdf
    • http://phunggia.biz/userfiles/file/buzobuj.pdf
    • http://www.cottagegrad.ru/files/file/24820512569.pdf
    • https://tramhuonghanoi.vn/upload/files/32192948975.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9bc03cdd0c6c1f489105bff4ec8cdb9b/2394983406.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=battle+trip+indonesia+sub+indo
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026249.bin
198175075bcbef69dba7b4515f6a63fcab8dc98a1234c3af0e2c59d2c33cca9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26249 17196 bytes
font_01_sfnt_off000296e6.bin
910d2954bc3268981341841cf1afe220fb1ff596defa496c1816d092d65d3a3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x296E6 20292 bytes

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