Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef532adbabb38890…

MALICIOUS

PDF

63.9 KB Created: 2021-06-20 16:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: a3c027acc5a51eb4b5a262d7df16f13f SHA-1: 5a4bf62551f3afa6433e84faaee7c2be2429cfe8 SHA-256: ef532adbabb3889078e33a2d3731bb3221dd1bae17a59ba7ac3812f5fa0e150f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160825a8307df6---nivaxinefexekovurifub.pdf In PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/7e113da3e84407843f12ec10df0f610c/lexotezumadixafakafixo.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/19677745873.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/zumijixokikefaxeduzixun.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160737f30a205b---luvigijavewedixazarabo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff475dc63c---mozodiwidekesuxeganometiv.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/26991522834.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d870ba5f0---wirupifof.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/9b8055d3c208e492af878c2f81bf5820/46438519691.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609f68ccf2435---xodogakimotalemorukozurip.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/53164050842.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kakifonatakebubuvowuz.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/badijizofonevol.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/kofoxowiropawizitapub.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/0tdafocspesc75koeosllq6467/numofila.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/xikeroj.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7644687533---gepesogogopirajotuno.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kamasutra+book+summary+kannada+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD6 5432 bytes
SHA-256: b4eccb35fc0d0e960b315bfd527a5a19d9efc0de79257574d9b9d3605c710bbc
font_01_sfnt_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 10756 bytes
SHA-256: f3f65fa3c1630def3e678f22e09ee3e5d14726a8dbcb52a9a4149b3c40083b1f