Malicious PDF — malware analysis report

Static analysis result for SHA-256 5183e0d834579522…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 00:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 817770ef7a6bc0b489ee7586a50e46e8 SHA-1: 92a3f8b1350b798ec35975c6b8a773c33600ba1f SHA-256: 5183e0d834579522868403ec49248e8aca9e8aaa95df4ccae29a8248140980e0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution, disguised as a visa application form.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://www.bandungmesin.com/file/79183520943.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaabb976b8c---48427779041.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f8fa3c24bc8---rexifidu.pdf
    • https://aronabritcan.com/userfiles/file/tuwenimawaronekiguxeguzap.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803bcfa5dad---91118060032.pdf
    • https://coastalstudio.com/images/main/file/88521575039.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/77921931348.pdf
    • http://hyunshin.net/userfiles/file/42232791503.pdf
    • http://karat-dobremiasto.pl/userfiles/file/86960952273.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/28db764b2c18116a3852ff629a0352d7/zizez.pdf
    • http://yhbinternational.com/userfiles/file/77013896020.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/j96c10k1hcsr6ogrvrp81545pe/929058995.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4e6bda8af0fd8cd1a0bbadddc097751a/suretagodagusax.pdf
    • https://printjet.pl/pliki_user/File/redader.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/mazanukakokuzoni.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/30bf703fcb98eb06aeebfc23b4437a3d/60258433703.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/komofepa.pdf
    • https://ptogel1.com/contents/files/56055672820.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/6782850867.pdf
    • http://jiab.net/userData/board/file/5620500283.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3cf85d0f407dc1aff5397ea55c062a01/vovip.pdf
    • http://dahchen.tw/userfiles/files/timiful.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3f6fc073c---gozefafeja.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098647739ff3---tegejagazotopixilu.pdf
    • http://duepassidalcentro.it/userfiles/files/silusibomaxaxumurepes.pdf
    • https://peilimineko.com/userfiles/file/wosegewam.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=new+zealand+visitor+visa+application+form+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_off0000da89.bin
4127878a865b38103e1b4bc986cce102d50fc56646f6ecd73455533383d13d89
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 10972 bytes
font_01_sfnt_off0000f408.bin
914826d49f5e53378a2d512e7b56241e04361812d9133915be4049f23977f76e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 16960 bytes
font_02_sfnt_off00011fd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 16792 bytes