Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d5bfe02044fdc6…

MALICIOUS

PDF

159.1 KB Created: 2021-07-28 00:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 47e4a6b409059146c0bbb03a7b8b7dcc SHA-1: 0dd2a11c8ed7485f311a43ecd00530ffc86eb630 SHA-256: d4d5bfe02044fdc6d9b065829db946e784b1dc6071c44d3b4d8d1ec22c3b9ac3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of JavaScript suggests an attempt to execute malicious code or further obfuscate the redirection process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/i04mci7m03iiet2l1ialbv4kk3/rutumak.pdf In PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86dc94f4f---jexawiledifo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/717bac5f023ffef7a941ab5691b27094/32774181200.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/wijudukezokomeropanenur.pdfIn PDF document text
    • http://jucal.es/images/file/jilejokitamapudumeboweko.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/a4baf7a7e5748ae15271564488a73e25/lituwudeveg.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0844b90c90---vofefesitufutoz.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/8033725655.pdfIn PDF document text
    • https://tmtteks.com/files/25072799136.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/e7219a98c02e727f0a606c73d5b564c5/63458125415.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/5707520763.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a30407e8953---66703747560.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/a2nat2jpii9fte29htj4shuk3g/vebud.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d9a9ac28---zikopufudukonowe.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2cdd69ed8---87559845417.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e8863158---mafalegiborifam.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/35824882727.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/ligujiso.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca066bfad6---kinobojodovexuzomi.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/u39lck8nfv4enpm6i974edodm6/fowakoxef.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2c0dd50a3---77683032556.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/38e6a519efbbdad5d649e62307addba5/gukujaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=call+of+duty+black+ops+2+zombies+money+cheats+xbox+360PDF 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_off00020ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20AE8 12004 bytes
SHA-256: 51ffc23bafc3c604c5e6122ec459e9364c5cd104e9c14abc6b7cda889e328df9
font_01_sfnt_off00022795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23FA7 17512 bytes
SHA-256: 64ee57dc5cd9b2608857fd0fbb50963d741a33ad5f925ee80993604a91ef2d3a

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