Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31c020cd950023b…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 03:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95740fbd77851e3c3c9e3ac1a486f2d1 SHA-1: 8d789259b89d52d1a7b316eb805e688a9bf86933 SHA-256: c31c020cd950023bbfb92893cc0e52bf695386f37efcd14bd29aa3001ba4e65f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other potentially untrusted hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure suggests it's designed to obscure the true destination of its links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8180

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://huanghecables.com/d/files/lekevetiniwata.pdf
    • http://ros.by/ckfinder/userfiles/files/97861022947.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/a5l7fp94plh1nt3908cq17iq7q/povalukufibijetufeniz.pdf
    • http://sinostandards.net/upload/files/zulubonajugilat.pdf
    • http://techbis.pl/files/file/fuxafiton.pdf
    • https://istanajp.com/contents/files/34620331563.pdf
    • https://thefencedocumentary.com/adminfiles/file/ligefurinodovuduzabunavof.pdf
    • http://syntra.pl/userfiles/file/26861641714.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138d268e70a3---nufapotirana.pdf
    • http://wpscrm.in/uploaded_files/userfiles/files/97388896139.pdf
    • http://apisicul.com/userfiles/files/33427103087.pdf
    • http://gonvvama.net/filespath/files/20210920055719.pdf
    • http://daisytalavera.com/userfiles/files/xedigudajugidijeduna.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7114726f3---77298163326.pdf
    • http://vipnovini.bg/root/f/uploads/files/tumekaxena.pdf
    • http://carlaschroyen.com/content_docs/36550707409.pdf
    • http://alacartedesign.de/userfiles/file/60741305756.pdf
    • http://www.prctech-th.com/ckfinder/userfiles/files/58006776814.pdf
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/28713914919.pdf
    • http://danangsculpture.com/uploads/image/files/50921431824.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+you+link+phone+to+tv
    • 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_off0000be8c.bin
61d46933da6aa099f4b88f9e7ae787b4794e7a0c6a956c7d810b6004576a5e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBE8C 16964 bytes
font_01_sfnt_off0000e9e2.bin
dde8b6f2958091aef7d1a45d3f8f6a901bd913ac79d48357357f0150584357eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 10484 bytes

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