Malicious PDF — malware analysis report

Static analysis result for SHA-256 405698a20d1dc20b…

MALICIOUS

PDF

62.3 KB Created: 2021-09-22 14:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 16ade4e0b0b2550d16f6c1963880dca0 SHA-1: c1d0d51157569731f06430b0577ba25f94a683c3 SHA-256: 405698a20d1dc20b41890dd12e70e03a91602fe535ba9afbe3eb6a69916d6e99
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, and the link farm structure suggests an attempt to lure users into clicking through to phishing or malware download pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7304

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.
  • 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
  • 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://pistant.ru/uplcv?utm_term=android+underline+text+style PDF link annotation
    • http://bronia.org/userfiles/file/tinuzubuzozojuvodawa.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/menujemepoj.pdfIn PDF document text
    • https://pcetravel.com/files/file/16949902573.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210912_9E6F0091E415C2FA.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/35235405911.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7a6357502e79e2deea9f1d659460ac28/11725827744.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89432427085.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/melanagegisanur.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/mimubunomulolevuwavejir.pdfIn PDF document text
    • http://merwepizza.com/upload/file/10672396392.pdfIn PDF document text
    • https://rais.bg/uploads/file/33509343708.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/sesisodiwalutakuxezuxeru.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4dab80c9bf0dc477541379058b0a33da/7258176084.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/xawepajesijenur.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///jakupopil.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/gomafukazozexufuwate.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/natomusukidazovosub.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/jowavavemogezaxipa.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/jupefopapodirafixogi.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/debawoworelaxekuleze.pdfIn PDF document text
    • http://deforma.it/userfiles/files/mugijufanirewasewogotera.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/pekinedosumono.pdfIn PDF document text
    • http://glendale.kopanramen.com/uploads/files/xumanironujoz.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6879b5c23---85467857304.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 16760 bytes
SHA-256: 74c07094be1d56648fedab6b8e1bf1180f51e54fa7370f57b2a416f18ac8c889
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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