Malicious PDF — malware analysis report

Static analysis result for SHA-256 450b59575181b487…

MALICIOUS

PDF

87.5 KB Created: 2021-08-20 03:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 80cea3bfa9ac61e0f83bf104441be0fc SHA-1: 3dda051f5ae1f38f6c6b856e984fc7631f32ebec SHA-256: 450b59575181b4872f891a14b37836dce2fd99d7fa479b7e771d7d132c019ae7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The embedded JavaScript is a common technique for executing malicious code or initiating redirects within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://garglob.ru/uplcv?utm_term=solucionario+ingles+burlington+books+advantage+2+bachillerato+workbook+pdf PDF link annotation
    • http://a-swiss.com/upload/userfiles/file/82027905137.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/36433170786.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/53830858543.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e130b4369f---busadodemoderepuzeg.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210625071146994314s0y0mf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/cvf391c5t7eqmcga9ee25fceio/67705892649.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/lanefexetur.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/sudozugodowijigeni.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81284681272.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/40011167963.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/daihjstqgme27tg6t02kbq8a3v/wezutalesikazotokewavu.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/17717195619.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/maxeji.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608bffe94dcab---49186595355.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/54897496517.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/sapef.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/kofeguwisesok.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/nt7r7ahmp4ubfdrh9pr6b98apm/35270317131.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d10f229c8507773c95ef11043aa8866a/99466145701.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/78994025493.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/58254340757.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/somevuralujikaf.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i6q1lccd9bfgau6jiht9duk4q3/6515640448.pdfIn PDF document text
    • 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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10752 17564 bytes
SHA-256: 8795d967b56bd3d5976ee3bd014cf86fe85131ac8f5cf69c96c637789ebc0757
font_02_sfnt_off00013393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13393 11580 bytes
SHA-256: 7d10629e7a3868fdfde01c8c4abdc55e0cc2d922d09a4e4eadd9145bb4d37c01

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