Malicious PDF — malware analysis report

Static analysis result for SHA-256 251e3c7fd0061bb0…

MALICIOUS

PDF

65.4 KB Created: 2021-06-20 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c64abe8d0803be3aaf2df1fb1c71d3a1 SHA-1: 8f25bacdba137ec6a77fcfef91241370cfaf9aab SHA-256: 251e3c7fd0061bb028a1ab68b8fe0a41e0473434237c785613a4a3ba464d4e3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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 http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c41ee30a9---ruzudezasexixebogemunumev.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3c4c242e8bf1132da429b3a245633828/fetisasekisamuz.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2507a0829f---47726785254.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/098541f9067f3badbc8d3b7af275a530/kinukasinezimemijaru.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093adb50dd58---97880255676.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/fdifktt27hgdcj212hf2hcmhmp/juvuvudibu.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783564ed77---37744000889.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0698403e---32257077896.pdf
    • http://bagiez.com/userfiles/file/xolukodeso.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5197614ca115c535bc8e8a66651efc8f/41938550582.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3c12a66b4e20cc57d3813a682535908/mapivefusipiwaluliruper.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ab8150a---piwekuvosuwawakujarak.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9061fe298a1108c8bfc8e58a6e195c0a/28576974576.pdf
    • http://voxel-avocats.fr/uploads/file/7880381192.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rm3f6qi87qj0hik4mg8t9lent4/volokozu.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7682087a5---boxelanotexelifu.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/2acf6d400dd00112f7edde21524a5f62/bezunutitid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=create+pdf+online+free+multiple+files
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd6.bin
182799d5a0a23a56cca0d20e94bebd2b75a1cc26e8eebe230abe2a4b3ddc054f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 5092 bytes

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