Malicious PDF — malware analysis report

Static analysis result for SHA-256 87df8e4e29855c8c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-08 03:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc0d495de2d2818e494b056cf8991bbc SHA-1: d2a73647162bbbede5b861cbdea79f9f88ace279 SHA-256: 87df8e4e29855c8c424eb714c70919ba1aed48e06a25a0d969843dd4e4d71f20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or 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 may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/41612785437.pdf In PDF document text
    • http://mopron.ru/upload/files/87082073924.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb17c4fc10---jupozorupu.pdfIn PDF document text
    • https://congnghieptauthuyvietnam.vn/upload/files/99888797140.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/88984532579.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c56782c3e66---66437824828.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/didotubafavitibafab.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/95280942545.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ffcdb88d0---sovinamaf.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/supopunujajomudab.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/vapawuzigusob.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/31303465066.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/jezuresilodurefazogupan.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/4bc533ff6b518da6e0db7a4fb38d2b87/nomewefe.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/00fe290a6d1336884641971c912bf1da/29059058767.pdfIn PDF document text
    • http://rfamilylucas.com/clients/73238/File/zosikovu.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/kpmen0joc1jo1n3d1d7rvnbvb6/xikoxuji.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f6dd8f041---62084533608.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16111dfd9571f6---xolakozogukip.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ef18ebdb---79107930145.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/72126927345.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/kakusetumadupenelemuxigew.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/73591288979.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/dofararubolapadutopoxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=toleration+act+md+pdfPDF link annotation
    • 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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 10576 bytes
SHA-256: b927e73667a2214c0d31e36308d821cd892196b8b39d1a829946397c80e2ec83
font_01_sfnt_off0001066f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066F 17556 bytes
SHA-256: 6d0e83d503b8e28cab96481540cb0e5bf6edcada0ec0003deb8560f9f405d01d
font_02_sfnt_off000133ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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