Malicious PDF — malware analysis report

Static analysis result for SHA-256 3237e44e37f59a5d…

MALICIOUS

PDF

87.8 KB Created: 2021-06-29 16:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3b7337ac9a8837be490ea6f656a6705 SHA-1: d01231fc28ec879f4c38a96374f93701799b734e SHA-256: 3237e44e37f59a5da67c0726f6e5a684fdb7aeb9ba5d9f0f7ff1a05edf5ff00c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to one of the numerous external links, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • 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
  • 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://crewmak.ru/uplcv?utm_term=invisible+man+black+and+white
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4cf2d0eef---92219994441.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/f40fe56cbd9a0f8057c4e3f4bd593e0c/rupavuganofuwusonabogiri.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160766d17432a8---jedebozapomeva.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ae89c3277---86275171942.pdf
    • https://xlspandoek.nl/userfiles/file/jopabenux.pdf
    • http://birnagarcollege.in/userfiles/file/12802526073.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c01ee52f2abae7a7f22cc707b8d1b459/28360723097.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d41b6d5be74eacd793e79fe119177c6b/14473683929.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/ffef927c0c66582aebaa98ec997063e4/76255697972.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/9tn5fqjj8s814vbs59rdc6tat2/moxuvolen.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/jiwuregolobimiz.pdf
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/1f14a7e69f3843998baeeefd9f60b5ba/pojikopuzoxogata.pdf
    • http://assytekservizi.com/userfiles/files/65050235098.pdf
    • http://ipmarketing.net/userfiles/file/35420542311.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bva7639hif3la3ok8du7klgst5/35112384325.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/99185e9676276be829dd01394113ac80/61673498263.pdf
    • https://arvikabc.com/images/uploadedimages/file/tubinotoxiwamew.pdf
    • http://andlupa.com/userfiles/file/tanawi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a875c3be614---84408975842.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68003c666a---22178904876.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/b7031aaf95c9c05d5ddfb7791e1bddbc/91814275262.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090df5540b4d---72810467790.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12334814c---91944746073.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16792 bytes
font_01_sfnt_off00010bc7.bin
8520d83026e7495d8707e66790d0ceaf38a7fb6c0df3de0759033c15914ec4f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 10752 bytes
font_02_sfnt_off0001245a.bin
21852965aa53b6f2eedbc8eda485b428e455c617cee9105c27510a8059f88fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 17176 bytes