Malicious PDF — malware analysis report

Static analysis result for SHA-256 5720cb29bba430f0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 08:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 353640c162d58742688e3424bc5dbf35 SHA-1: 9754df629512b6e297cae7830e113454b6979558 SHA-256: 5720cb29bba430f028af1ffd1c253fd7bd27b4bdbcc6e1345704e045fede05e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alternatifhirdavat.com/upload/ckfinder/files/82406794404.pdf In PDF document text
    • https://cezartravel.hu/userfiles/file/22877586968.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/fegisuro.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/jefad.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/danevopibidujo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff0f8339b---gopejugix.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/megito.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xinuxezibubokutawinejuzo.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/27510093058.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/powewib.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/xexunajariborek.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/21034811971.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/dipobobobolafu.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/zulozajuvuxi.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145adab29aed---50044914330.pdfIn PDF document text
    • https://resicolor.com/upload/files/71488263913.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jovedezeguzutetufipebu.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/96503258110.pdfIn PDF document text
    • http://techmechengineers.com/uploads/54033874790.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/lovuzadokukat.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c64185f66c0105a9e979a6d99ee92556/majuvobevobex.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/pakenaxibu.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/banukubuxika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=8+ball+pool+apk+download+new+versionPDF 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_off0000dabc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABC 10780 bytes
SHA-256: 96ab16a822798dbfed31c3effd694944fe03698dc18342822ef9060db3b4ee8f
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 20532 bytes
SHA-256: a469f76029a9d44c243846786cf7903e03545ab26d955c07401b1dcf726cf8d9

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