Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bdfb2838c4ae8db…

MALICIOUS

PDF

80.5 KB Created: 2021-07-30 09:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 899e400e5f3db23d5d5d6396f50dc0ea SHA-1: bf58b6c154ca331e90da5ef248333646fbd6d104 SHA-256: 9bdfb2838c4ae8db43794c3557a386cd5c7baff7fce2387e23e7a1d262e964d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a network of links for potentially malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://noahsmarinesurveyors.ca/userfiles/file/jiwazaxutif.pdf
    • https://maconlux.ovh/userfiles/files/5087724758.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0c4757cbc---67319640509.pdf
    • https://ctners.com/ckfinder/userfiles/files/94605326980.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/sofinudibez.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ac5173f3c---9739162259.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1c485791b797b602d8ca1b9998650088/70117747297.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/290fea82416db1a68cd52e0bcab3b733/29360313760.pdf
    • http://www.mostenpo.jp/userfiles/files/sositisikotivepajumuw.pdf
    • http://liqaa-lb.com/files/userfiles/files/39672770061.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ab0c83a0---junokafusupimofibisutowo.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097db7ec44eb---purapitinuku.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b97aa32f1---temamapide.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/zugilinaj.pdf
    • https://businesslife.com/content/file/60680217486.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c83591c1---muvokugejum.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ed1a73a281518ab75bc6abdb74c4f483/90289501377.pdf
    • https://avigailpekelman.com/sites/default/files/file/dufutoxepafazijerora.pdf
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/sulivolafetok.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9442db0d1---80906008986.pdf
    • http://kojeneckezbozi.eu/userfiles/file/gemiwav.pdf
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/97bc35eeba089fea20d17cf0cb83c155/3109225616.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=carbonato+de+calcio+formulacion+quimica
    • 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_off0000d6fc.bin
54704d10410ff5c0a58e48971ec5c85eebc790c28a1dce27c1754aac12d88ee6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 17012 bytes
font_01_sfnt_off000101af.bin
c40471916bffd16e7a198378ebe503bebba1332ec1322a59dce20976679eafac
pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 10888 bytes
font_02_sfnt_off00011aa3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA3 16792 bytes