Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bef62171e6e987…

MALICIOUS

PDF

78.6 KB Created: 2021-09-18 06:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b39ed19b698667be73e4a1780d76166 SHA-1: 01212a7c62e90d302a3944df5257b65e1a47dcbe SHA-256: 63bef62171e6e9878e6fe4e46960c060db040222e96b13d392d62865723f021c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also features a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious downloads or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=android+tablet+apps+free+downloads PDF link annotation
    • https://vadihosting.com/calisma2/files/uploads/jowegogak.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/tisaza.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/turorupebetoz.pdfIn PDF document text
    • https://12shio1.com/contents/files/vewur.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/tuvolirubononujokibuni.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/levikejenajak.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/66949201119.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/29552857760.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4ae3476f---81683644153.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/48425853282.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a368d309bb68ce4f129c67aaf9d669ae/62164004017.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa80679f5---kodarek.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/884064026.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210905_3A90E9560B76F0A5.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/mevamaguzojijijodixitera.pdfIn PDF document text
    • https://ayurmitra.com/files/file/38455899565.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/93962979524.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/guwelugujilowa.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/168324676.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/robubetegojazubapeludax.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/lofadelevixeravemezenik.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25044af00---sidazupozozivobagurop.pdfIn PDF document text
    • http://atya.eu/files/file/fizutibizala.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_off0000d0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E5 10696 bytes
SHA-256: 9260ebf99be509faea979cd4e1b371ac892c9fddbc596da0f70f77f0169f04b1
font_02_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 16800 bytes
SHA-256: ea35ecb5cb60f4d623b9a57f13e15e366d0dffd9cef12cf13ea7e84aff4fa33b

Open this report in the interactive analyzer, or submit your own file for analysis.