Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98df127b884b981…

MALICIOUS

PDF

80.9 KB Created: 2021-08-21 20:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 11f4a28cc10743845b4cdafd5c85d636 SHA-1: 11663ee9ac8893649d1df6c8a923dcbd2169e810 SHA-256: b98df127b884b981f97fe976062b1e4ea738c2ef0c56fe5556d9bfeadfd24be7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9985

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b498cd7d046---21680893009.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51ed8a504---faresububivaxugufukovaruk.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/dewonekugelitad.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/parotokubuju.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/39f42g2g5uvq9jvukvil975j3q/65723820435.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/f2ec800615f7eaad4f81071c4d6d0f6e/50427646952.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/kipamewew.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/64099900633.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/zekodirobimufizimekege.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a685c28b34a---7063472373.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/vubanewegaj.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9ddf1a632---73604744236.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/75493102884.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7f9459172---wuvukejosemusekekososabi.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/rimixe.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/sofutofewupomabolixetig.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/mujuxerolop.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/40999391270.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/silulamerorop.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/9lvvfoni8ven4b6nff1bufn586/loxadarivudazopake.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/3842bc1bcb43baac9cb42c443d0c8cf2/sixokagulabixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=are+autopsy+reports+public+record+in+nevadaPDF 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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 16768 bytes
SHA-256: 32b3acfe39a2bec48717e35654514098ab252b59823ebf59828dfb705fd9cdf2
font_01_sfnt_off000104cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CF 10908 bytes
SHA-256: 2a266774cd357bf5de22088088ecde5514e377ceef246278a78d598ceceb7277
font_02_sfnt_off00011dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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