Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7b7ce3d61ecf5b…

MALICIOUS

PDF

61.0 KB Created: 2021-05-02 09:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddcc76a22f55c5b9f62b359fb29f53e1 SHA-1: 36d67e2b9520292bea2baf3656db9e1783dc1dea SHA-256: cc7b7ce3d61ecf5b9e204ed4a2237ac14b72f91874550a07b8b6000cd55383f1
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting, aiming to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users to external sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/d6abc1c5589a77a8a5a848a9fddbaa40/25124745753.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/ee358b3af0f02199f02b98eaf0c7ecb1/gemefuzomerafi.pdf
    • http://nedirajtebosnu.net/userfiles/file/26203155034.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f437aef17480fe5f08db67268d65c97b/neripezizetikolunud.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8b0b4639c37bf56d6a066420956d61c9/lubesetinapa.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c896cecf66---fodidek.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fbcfb974e---39727262134.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608084adb705e---30763423893.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/cf4ceb485230e8bd7e35c98c5ea3433a/nezufefugagovezo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ece42644---86414166850.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9afb465c2---tewib.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607869152061c---soxepixixanirurolosa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864f741c7eb---vobexaz.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ea5bac4703c2538646317d85fd565b73/fijuzetenalotijon.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf44605ea7---diwazizibarafukutoju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sri+lanka+national+anthem+video+song
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d840.bin
83c75de1df49dbad325b60cca8677e5ca903cad82d6e68eaae682edeac2d1e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 5468 bytes

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