Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ebf7339e12b26f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 05:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5462bef34418965ecf3984544ae6f359 SHA-1: f40d95ad39577816d787ae37f246783adddc4853 SHA-256: b1ebf7339e12b26f337a6f816186ddd91475d0110b4ca9013f471f588a3aa095
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The embedded JavaScript likely facilitates the redirection to these external URLs, which are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c562ee26d93---30437623722.pdf In PDF document text
    • http://alfavit.tv/userfiles/file/55284452434.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/kunoduzo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5ca632e33---41035247998.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/pelinojoga.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/7121c571055977f6c21ebf4529525c90/wezizisazafos.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/64157634435.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7ae2e160c5d8a58135d157936456c59a/gofexijinikuvagasobe.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7af6da453---nukumutufesidapilejagep.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/nowazaduzaseburil.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa341a5aa---wusozupogixexiberulo.pdfIn PDF document text
    • https://emmaushuis.org/pages/bolupitejo.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/vabelin.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/jopopew.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204e4bbd4fc---85576217484.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/nifolan.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/50878293617.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/42416674048.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/55264355894.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/29097853169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=antibioticos+pdf+2019PDF link annotation
    • 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_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10578 10756 bytes
SHA-256: cf5b42f616998573600c5c49789abcd2ce928428e1d33a9e2ffff4eac9af24b0

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