Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad84928b96b4ac9…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 09:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82bcec39ca86dbbc0962d0794fb61f4a SHA-1: 5bd24d7897e58385b206a9cf094f252c2c3671f1 SHA-256: cad84928b96b4ac983e43be161c004405159a73572974355f82937c0b56e23b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://philabc.ru/uplcv?utm_term=handmaid%27s+tale+can+wives+get+pregnant
    • http://munsusa.org/userfiles/file/20210515090932.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f0acbcc029bf9abf6f25824d94d138bc/boduve.pdf
    • http://daiichilogistics.com/uploads/news_file/83679285588.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925439ece98---zedewexanukezenejuve.pdf
    • https://feldmann-spedition.de/pics/userfiles/file/36416908044.pdf
    • https://altaspin.com/calisma2/files/uploads/vepigupamufigitinev.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090292d4ed17---wimafujijopukibokumolut.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252a17ad35---gesexor.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/b021754781bc814035d4ed0de693b0e4/32265962634.pdf
    • http://mackyz7automotive.com/js/upload/files/manamilotitularamenurom.pdf
    • https://aradmissions.com/ci/userfiles/files/voratoxi.pdf
    • https://ecotranslation.ca/upload/editor/file/82182418052.pdf
    • http://ohappy.org/userData/board/file/takujuwov.pdf
    • http://www.nomorcantikjoss.com/file/zizojakopajoveralol.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4b0hqa7spugmp9cdd0v693o8f3/bobapojerajidufesuw.pdf
    • http://kurier48.pl/files/userfiles/file/beparufexebizofaxax.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/958602c109bd3cfc71e13f8a5d107c16/remevusejesulufaxuru.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607096a24b31a---36415684043.pdf
    • http://innospectrum.eu/hirlevel/file/jetekemulibenujori.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/917ea4efb0e40cf7a39f527efae2ad61/molujoxok.pdf
    • https://capitalsyndic.com/userfiles/file/mekiwe.pdf
    • http://bluecars.pl/userfiles/file/bixudasulutojovakir.pdf
    • http://thsport.dk/ckfinder/userfiles/files/81303948225.pdf
    • http://hainescentreasia.com/images/file/79366326134.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3f8f3042d---tegiwizetuxelakeduzewut.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_off0000f0a0.bin
62fbbc4a357e675da00884e61fedc6c350c7cb45e73c4a544e7babd3a3964c58
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 10912 bytes
font_01_sfnt_off000109aa.bin
c2a873a9dd9d44291cd911c3c472d2c661d471f05b7585ebbaf125132be91abc
pdf-font-stream PDF embedded font (sfnt) at offset 0x109AA 16516 bytes
font_02_sfnt_off00013486.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 16792 bytes