Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42568e3b68cc8b…

MALICIOUS

PDF

61.0 KB Created: 2021-05-21 22:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dcee2b33cc22eb4aaf0a0db704cf571 SHA-1: d938bad1e4e3dfe86e2f42fbb2b4edd8e18bea2f SHA-256: 8f42568e3b68cc8ba217409cfde5818acac03df7e14f80ddfc201bf6e932c9de
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution attempt, possibly leveraging compromised CMS uploads for hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/eee1b206305703a2a2a263d5732a5c54/55313436054.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/86fa79bf3ebc5df0ad6e1defe78b3954/wopotilavetun.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079d43762ffb---fupozevuze.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d39592cc8---6946413844.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/3a0685b588e33cf770c048bcb8c9f14a/kitudigowi.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160948ff29a6b8---26110546080.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160755c8e52aa4---bapux.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160868eac00f8c---nidetejameme.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/df5ba9d73f82a6a9ee79d427e0a1f747/wafitigirixe.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091987b52c01---97562416624.pdf
    • http://garmagostaran.com/Upload/file/kibobazesulatatemilex.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/edmg25u4j8756ii8cftulmmlgg/79475974917.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d642200fa188f7c30c01af9b6def8b8d/migojivilufijigodanaweduf.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160904cfacc45d---bobes.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e13bcd07c---wikopowomoxuzamal.pdf
    • https://brahmagnanam.org/fck_uploads/file/jireragipurujuvi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ancel+x5+software+android
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8be.bin
3292026dd5225efee13bc9e01286387c8d0a9b8410fe8d7f5611762a9c527c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BE 5288 bytes

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