Malicious PDF — malware analysis report

Static analysis result for SHA-256 f957bd2776b73b79…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 04:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a8d9cad9a83cf78e8c819577ef5cdd46 SHA-1: 8c117c2701fb3aa729d34f6e49aa33a9840895ea SHA-256: f957bd2776b73b79190e88b0724503eeee4f2796ee4baff0eae049966ae015e2
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7117

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://genegurumiraclehealer.comuserfiles/file/96638106514.pdf In PDF document text
    • https://villatoscana-pi.it/userfiles/file/75357822447.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f5e53b6e2---zebomosomibinanujupoxag.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/52942982867.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/47596181770.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/2ab90e5c7188445ba415c474faf06205/24485483556.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/suzor.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078608949041---73813134156.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/31321104771.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb5eedf3a---89966492719.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/xajozebivemefafoxa.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/50196617015.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/fipibegekewoxe.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/9111223313.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/237ebf3e26028af39d1a6cdb77363e92/mijadafavizekabu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160711f4cbcb30---52906094742.pdfIn PDF document text
    • http://hidramaco.com/files/files/20952353571.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/40d4f385ecc93ccb25e93ce0e69fa14e/86743599592.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0a2ea2af---vonejipugukibikugifoli.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/76988413745.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/16006578278.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16281244678213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=reasons+for+scramble+and+partition+of+africa+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 16988 bytes
SHA-256: 8c6d449d3e37456592a91e662f42acfc04002f5ea58a118f59dc3d459a5f9fe3
font_01_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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