Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bfc8ae9bb9c95e7…

MALICIOUS

PDF

85.7 KB Created: 2021-07-13 17:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 137a24ee5d7cdcc95172e6bfb1a5fde0 SHA-1: b724f6f42c086588eb0e654304e09b88a9e8b0dd SHA-256: 0bfc8ae9bb9c95e7a20d917d562e5bd4180678ba3ded3cbe9c80c6e9bba0acce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is a common technique for executing malicious actions. The heuristics indicate that the PDF is part of a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fdcq0jmuuub3ri7qku0osdmmql/74656981595.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac88c3af584---bokinexovamaxixedikomenat.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/petudijomax.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d3ouroah2ndp8mhbn9b27pba06/jeporo.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/94514187979.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210623_194203.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • https://airbays.com/userfiles/file/91863589912.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070b4c316e27---3855690263.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/jewewijogaf.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2951ac85---zavimimutof.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/i59kumaltsq5792l918m8a2c95/fidosipuvaxifum.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/buzagi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ee42f35cb---lubiduruximokuxobenumotu.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/faxur.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/tatux.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/gebigenelubakivixef.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c37c48f84---57924940648.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210531004242.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b4232235371feb28605f831f88600351/jupudedunokakaxuv.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/resuwomutujuxezibawo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/zavizibixiwajakogo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d06e07d72e7---47209072102.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/58828911355.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/217ffd203b8b5684cd7e749426732339/fawivedaxowidizil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bible+verse+about+seed+bearing+plantsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 17404 bytes
SHA-256: 79b9f7995909d3bc6fffa3296b653657b135fe5a54ffe0307688ef4b12788c44
font_01_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 10928 bytes
SHA-256: a94e2a6c13ad96cd948e70488230deb86ba3110caaa7e8590d00cabee72edb45
font_02_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1