Malicious PDF — malware analysis report

Static analysis result for SHA-256 df76bbfbe1202220…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 10:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cb6653077543014e24327ad74b4fc674 SHA-1: 82063efa74fd74437f25cc6481c3977aa6953d97 SHA-256: df76bbfbe1202220ea51312ab30a03de051b8e5cce5549019659cb9d92dedee5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URIs, many pointing to compromised WordPress upload directories, suggest a link farm designed to redirect users to malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely intended for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5182

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://wastran.ru/uplcv?utm_term=android+auto+user+guide PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d139b72f3---38645231463.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2d43b500d2---94321421418.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/3204736378.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c273e8c00---10843074840.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/zolekubepetabakag.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/rixafegowelub.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/96829617467.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/fixelatiberose.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tubifevewoxuze.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613026ba1aec6---39288459133.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ab45b785377---bufusego.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/v38ugnjo5l6m2073i0cpoqo8vu/31732387376.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pabakarezog.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/14707379354.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610781bcccccb---lifejomu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0fc96a777a86685b1cc38bf170c33dfd/solola.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53387130537.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/deb8b7332e581b1dd0eb87df5ace2d26/95636989293.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/71524841719.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/54573681475.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/kixivimuxomukanivukajuk.pdfIn PDF document text
    • http://kasargod.net/uploads/file/24928100703.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wavixovula.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 17488 bytes
SHA-256: 3ed14568fb4e3a3731440c81ba6b215f4ce1fa1469f7932ae935a61d0de3e9ed
font_01_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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