Malicious PDF — malware analysis report

Static analysis result for SHA-256 503ad40bc76549ab…

MALICIOUS

PDF

63.7 KB Created: 2021-09-16 02:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e485b92522bd98c69976f07dceff406f SHA-1: 0a9d71d3512ad15e4401be16becbd84e3ba33833 SHA-256: 503ad40bc76549ab6cdb5902865a348e8e9865a45a6c222b1ce75c94b0df7a24
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection 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 0.9575

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.
  • 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
  • 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://infrive.ru/uplcv?utm_term=android+java+voice+recognition PDF link annotation
    • http://fijiembajak.com/uploads/ck_uploads/files/17103141353.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/gaxisoresedudasipaso.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/vamigajipewadofizugeju.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/liweki.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dadeebb232---kowiluguwag.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/76951002198.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/98531297880.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210916063010.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/terikadimuvojoza.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/dotozawufotimarunifap.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d8ddbbc2---ravoxugubomugivowitapama.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/derosufag.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/jutenuverubo.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/4674498768.pdfIn PDF document text
    • http://infunplastic.com/d/files/widosevawuxetodivup.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/pisebinebatokilaf.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196120518442.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d325c4fae2---fovexavipasilo.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_04806BCCDAB6EE23.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/55dsj9u3ddelb4de5fau69em83/sakomexileropur.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/tuginidigatudiwomikat.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E5 17076 bytes
SHA-256: 6301c03965486ea85c5edf7f464c059fc7f5b92e41a98e5f30520f4d98d79726

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