Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5c52bf105016bc…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 23:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4910fbd9df6e457c5357e447d7d64fe4 SHA-1: 680d89f016159dc378a836833978e51fd769a831 SHA-256: 8d5c52bf105016bc1222da4d8bc0821d8b5cf2cda10ce70e294088eb0b06f475
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The primary function appears to be directing users to potentially malicious or phishing content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7368

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://infrive.ru/uplcv?utm_term=voice+exercises+before+singing
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d636282fc---17608747963.pdf
    • http://dentherapia.hu/files/file/62526525690.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed9ca02186---repidi.pdf
    • https://coil.hk/upload/files/76847626564.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/38341365292.pdf
    • http://foodchemsino.com/d/files/92053083262.pdf
    • http://mousike.it/img_ins/files/vukitoduxudamogepidape.pdf
    • http://ersatzmonitor.de/userfiles/file/kabidakisidegibe.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/6300441772.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775af7060b0---mezawelanerebaje.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/12565911650.pdf
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/3039282677.pdf
    • http://okmarin.ru/userfiles/file/86923794508.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c6347717---kulokonidalupuwivoxisubir.pdf
    • http://ecogestval.com/userfiles/file/wekelebat.pdf
    • http://abc-tel.ru/data/File/fisedofejakugijobope.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2c8fb7ecd3995f40f2d52ae0b7e8a29e/metemafixerixemile.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/98d69aaa1f0806cdd625455407212645/79059843441.pdf
    • https://altonika.pro/files/fck/file/worum.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/40036236a3680f66e38d9806a3b4d5f7/78646551156.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4435951bb84a1316c5fabe4e45ca8ace/poxejukokusinegejesijox.pdf
    • http://szentdorottyapatika.hu/files/39975266623.pdf
    • http://tragadsonisurat.com/ckfinder/userfiles/files/wiruferojarusazotipakewoz.pdf
    • https://legouic-peinture.fr/userfiles/file/64234899475.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140C6 16792 bytes

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