Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6af38469242fd3…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 08:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: db203bd4ec6fcda0881858490a658fc7 SHA-1: e0b4bb57da246a12e2390e01c4a56536f330d488 SHA-256: bd6af38469242fd351d19f53677b6974ba1642ad6f408b0247c25310cae8f970
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution, as suggested by the URL containing 'idm fastest download manager pro apk'. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a secondary payload.

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 http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47992636610.pdf In PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/kexerujogikejufixetep.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131f26ec9946---dovijitokudamixefujatak.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/67229968811.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/jozabevarubijubu.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xinalesaj.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/48863595784.pdfIn PDF document text
    • https://eurotig.ro/file/7979189598.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/ec833a1824a9a36bfdeb60f0889e5a9a/37220850709.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/zideg.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/28542192671.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mubeb.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/jutuxu.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/14084490064.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/97693410627.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133048d73c9a---83744296048.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d137544a27---86069066141.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd4b1b9217---37714143188.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/55760552380.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/6784107596.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/nafejevi.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142b8881db77---kalezexeva.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/85360074806.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/60225315750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=idm+fastest+download+manager+pro+apkPDF 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_off0000e01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01C 19880 bytes
SHA-256: 6b62f46c712e36ed656a323f11764001efe34804b08691467ad1d4a310e7435b
font_01_sfnt_off000114d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE7 10880 bytes
SHA-256: 56ab0b23db23121ad39d6ae500eb71e8c0cb0c41d5357d534be5e0e4c6627c93