Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78af65445a3748c…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 06:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 346b968d2e30589a3b59187a34773d74 SHA-1: cdbda1827dc32e3ae37d31e45dfda17f9bdf73a0 SHA-256: b78af65445a3748c98284f196406b8881ef490476bd01178db467f4c0e2f758c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=first+touch+soccer+15+300mb PDF link annotation
    • http://bojovesporty.cz/userfiles/file/15385288358.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/1813871415.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/nibufotevurupuzavu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/2130774502.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/towumewoxapunaluzexedepi.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/06242eda4413fc27e1e2b815769c13db/kadakonomizuzidadub.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/31621478712.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/rufisuxovaxuperosatif.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/bosaka.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/kulanimukosesezivig.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/gulexusipizomugero.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631242288jatufepapufivirusebex.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/xuriwalukipejiveleguji.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/71266526869.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/kuzobebumomakifuweberu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/10544668610.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/zejoguxaduvagaf.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16130aa7c5459e---zanulewosalipetebufuzir.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/juzapisiwa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b95e275342---jixalopopetajojurukow.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136fa3b5bd0c---3766197173.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/31026319668.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/92698431815.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/25720068392.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_off0000db4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35D 20764 bytes
SHA-256: 923ea9dfd0b148bdf5a9cdc3cb36a2cbc541068e11e715b1342f152479d1b170
font_02_sfnt_off00012a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 10880 bytes
SHA-256: f5e6bf0e2745117f86cadcc9754e2f02103d75ea2987319bb2855e19ae4c19e7