Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5d1a6f377a537c0…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 08:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de883438ee4894ee9d430d0a71b5d7c0 SHA-1: 159833ecf072128753970f3224fd5aab86c02578 SHA-256: a5d1a6f377a537c0b66d7bd2a1dcecc7e46167cd85914cbfe9f7f4187836312f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier further support its malicious nature. The primary attack pattern involves luring users through these links, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6342

Heuristics 5

  • 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
  • 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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/41982afe07effec69568e8162d01411b/63481566467.pdf In PDF document text
    • https://eco-translation.ca/upload/editor/file/difabalupinonosij.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109082218163360.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210911231735.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fadoluzalexu.pdfIn PDF document text
    • http://sushibelovo.ru/files/bepafedux.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/kusudamukod.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/17083640722.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/37655230030.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613e4d6205801---81845603549.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/398cd2cb6cbd93208602ca2af3365aa6/25772963455.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53b44bfe2---kikaremotojudopum.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/63ca852f13e14d3d411e00a968392d59/46616958827.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/taratog.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/8192112471.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/31913559265.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/vasizevizafiselazosasigu.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/tababudugajododibesu.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/rarebutegenodiloz.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/wixugujexawuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=clash+royale+online+hackPDF link annotation
    • 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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 10464 bytes
SHA-256: 31025539e700299479d01c0fcdbb98ca14d93f771eac696211a4b050c532a5b1
font_01_sfnt_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 18016 bytes
SHA-256: 27809803f2a86646c72ada417cc88554613fb3b4e42a580aa31664a98e57cc33
font_02_sfnt_off000122ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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