Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cde72c9eeb8911d…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 23:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6336af52d5b25e17bf362338a8fc9dbc SHA-1: 89428e34623c9c0de3a54443593885d86eff7416 SHA-256: 1cde72c9eeb8911d6e4b376916ef798075e44b5c9d91192d046667c36cac5366
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gunjanjain.com/app/webroot/js/uploads/files/51927794619.pdf In PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/66448998186.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/64848278559.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5b1a1ac99f87744e77df437eaad8564f/4652491603.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/93896446001.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/60494064065.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/9859407767.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b840dc5c4f40c912c329c05de1e1a0d9/wirusakadeto.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pajidoxaloronige.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097c96090c3d---93856858756.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776d07517da---98064600961.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16081e9d5de7f1---wadufezoxifotebomirolomom.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/98639723203.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ea4bacb25---xulijokopajijugatodijoref.pdfIn PDF document text
    • https://andhimazhai.com/images/files/vamokapunesimolofufos.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/51566715738.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/pupiwetenowaseteledakix.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b54c0c52c38---gufisukovibogezifazakoke.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/dupagazefexasugal.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/0ba922816b1b0a6e3656a02b3774e909/24758623579.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/18331805609.pdfIn PDF document text
    • http://babamoleskine.com/files/file/melalutowopo.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/32755744167.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/52428601198.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=through+the+woods+graphic+novel+pdfPDF 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_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 11112 bytes
SHA-256: e96ca552b74d6179e1e616d26800bc379806ce8afa5941583b460ce3c040993b
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 18052 bytes
SHA-256: 8d897e0e9caf17351891eb4f251ae47b38e1c51d30a7af5fd4ba868721688561
font_02_sfnt_off0001407c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1