Malicious PDF — malware analysis report

Static analysis result for SHA-256 16cc76d9da62b5f6…

MALICIOUS

PDF

75.4 KB Created: 2021-08-30 15:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7191ceb38c3b51145ed32b82c9d9097d SHA-1: 5e196df7eb54b2e270a962c5dfb429149af5d250 SHA-256: 16cc76d9da62b5f651a6602716d2f2a5d4aadbb0bd90c08759955f2cadd2aea0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification also flagged it as malicious. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to lead users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550433a523---11072305551.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/3689628084.pdf
    • http://www.azurwelcomeservices.com/userfiles/file/81762783806.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/tebunopitanig.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3bf250cce5bee9df929797d60555039/82056321592.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb894e63fe---13974798305.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/be092f77397a95e58523bdc8bcfd8c77/36371250042.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c94b85bcd---17542722274.pdf
    • https://belhasasecurity.com/userfiles/file/molibogajokuvexusezo.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1468f02f2---79453251517.pdf
    • https://pmeds.us/userfiles/file/botajodemil.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083449d4569a---24317097204.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f75e2d300---81189986931.pdf
    • http://mini-garden.ru/userfiles/file/rujudo.pdf
    • http://kdbelektrotechniek.nl/uploads/file/jilenololijitovojewetaker.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/dd29e4b747735902454ae8925d60bbc0/soxofe.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607395678be5f---pijagew.pdf
    • http://kssi.ir/public/userfiles/file/zuzolela.pdf
    • http://gibisch.org/files/files/gafojukumonajuneni.pdf
    • http://mariamozharova.ru/uploads/files/katusimufamijupike.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161115a18221ff---66938243655.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c1e93966806a0b48c36ce83c3616c2c4/katedisokuvogigopunix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=balance+the+following+redox+reaction+by+oxidation+number+method
    • 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_off0000d57d.bin
d3f5909f50dd452e472c4089f56a22d64b16caae96e151f4fb3a444ff6bb2043		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD57D 18216 bytes
font_01_sfnt_off00010541.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 16792 bytes

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