Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d7f6fb26f9e230…

MALICIOUS

PDF

77.3 KB Created: 2021-09-12 16:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da20ee48e74177a2597f2caca6fb7633 SHA-1: a2acc053027dfaec316d0f4fa8b3c397aaec3831 SHA-256: 40d7f6fb26f9e230584194ff4587e620096d86ff024c5f892bcb524e473423d6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through a link farm. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://redengewinnt.com/userfiles/file/1957694648.pdf In PDF document text
    • https://dd-inside.de/userfile/file/77402858866.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161352de90c6b2---jinafe.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/75769580105.pdfIn PDF document text
    • http://dytac.hk/userfiles/gebowukiki.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210901_054856.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xazetufunutujudewod.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/65556254692.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/fufajamelewunologiduk.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/76943344008.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/rifowovomikunoj.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qacict9j4hmfm7lv043vkhuqv5/68354406542.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/58366316785.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/renudi.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/rifafa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613394d5377c3---25639905310.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/ledatuz.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/58043695997.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef813b80ca---wisojopavijabusev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ultimate+dream+league+soccerPDF 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_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 17744 bytes
SHA-256: 0942ae61be0bbf81cbd96365cb9e62f60e57fe1f1aa4bc28848a8942162f4801
font_02_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 10716 bytes
SHA-256: 7b9d43954904186f0e2fc5aa2bf82da06cc0aace5065acd8fc42c639563775cd