Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf75a96020b7a6fc…

MALICIOUS

PDF

96.7 KB Created: 2021-07-25 02:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd3cbaedf1f64dfb5b1513f5c0ce2f0b SHA-1: 900ff91e5b49bef325e8e8f07c8c445b33cc49b7 SHA-256: bf75a96020b7a6fc14e8c2b15b941c11a30b615b9e8ad9c190e2692ce8310cb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites hosting other PDF files. This suggests the sample is part of a phishing or malware distribution campaign, likely using the JavaScript to initiate a download or redirect the user. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://clubselectionvoyages.com/images/file/wuwejutekan.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ca228be7d---kuzupor.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79de06bab9---44498420786.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/1a38c1017b480631f39f94b152c7264b/98084258571.pdf
    • http://ateliergermain.net/sites/default/files/file/kujamujotaralizirazotu.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/09589aac78234a503f294e3080c9b4c0/rakiteken.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d511290e53b5a7cc5aa3f108c04de0b1/xunumasijapubowibuwev.pdf
    • https://combrooncom.com/contents//files/43857146677.pdf
    • https://tecnibat.net/uploads/archivos/xikirojise.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f8ac0093---88622881931.pdf
    • http://mariangelesorrico.com/galeria/files/sobel.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3b445v8ihh9g1ip9hgu32h8ps1/sesaxulegekokamaj.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/30982737203.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/671886cc72988816dea49131b3941f10/rakab.pdf
    • http://mega-treid.com/userfiles/files/kofonopepomatumelitifo.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/a791eja6jkkcaom7ea4o4a8q87/16439994154.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3588c595ba0e596d18c482d022eca54f/81470296049.pdf
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/98317649657.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0befff0cbae4ba032678ed1964f100fe/40078384418.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae11a71f22---dodolakagonudapajikezik.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pbmom124666km5as5d7mkq984k/duxosadopizuvaraki.pdf
    • http://edgecs.net/documents/23406169984.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e5e2ce2d---wetadolagoteluribuwud.pdf
    • http://espacioschillout.es/images/admin/file/72545841597.pdf
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/bubuvunenuriserefazeziput.pdf
    • https://empezo.xyz/js/ckfinder/userfiles/files/dituweti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=manual+debut+video+capture+espa%C3%B1ol+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001012e.bin
99b0aa1ee1432e81b2e2cb6b440253bfc80515b7c31f40b87d53cb1d959ecdee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012E 11120 bytes
font_01_sfnt_off00011ac0.bin
0a4db19c6af6d37f3df4b9dfeaa190162a87258086b3696a53c3603eb3c2a740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC0 20808 bytes
font_02_sfnt_off000150b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150B1 16792 bytes
font_03_sfnt_off000168be.bin
57a73d877970e419005db3c38d676d43bf95a4071fcadb27eca2cd578d21aea2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168BE 1684 bytes

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