Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89fa07e90f37ff4…

MALICIOUS

PDF

76.2 KB Created: 2021-08-03 06:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e94879e3c1840d127f7737ea26206506 SHA-1: 47101391185bf6d09ce9cf359e63545889e0ea6c SHA-256: a89fa07e90f37ff4ddab1d0dd8f1b475a68bb47da9948a36b6d3f6462aafa774
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6774

Heuristics 6

  • 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.
  • 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://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091146c93440---depudul.pdf In PDF document text
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/dexitor.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdad32f057---nitakisitiwebidowakeme.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/levuroxigikovexuwed.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tapavab.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a798cb1139f---32351568614.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/2301109347.pdfIn PDF document text
    • https://camelcarpet.org/d/files/lotuxo.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/lofekenufuvezotuvup.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/73947428177.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088727be6302---jetogunipibofobaz.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/fe769f5a05677a89b4adb931933d431c/rimolawenuju.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/661499f8c6b8a4e8d2e180cf95539b6b/16496822194.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/vomeloxevuga.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/03f560f11e9c6a159d2c5c4a9db97031/69703353100.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743f3f0dd9a---51191998810.pdfIn PDF document text
    • http://topas.lt/userfiles/file/30864905945.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/22077210220.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/22985549116.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/sipopediwar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=do+bounce+sheets+repel+micePDF link annotation
    • 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_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 10716 bytes
SHA-256: 4e6383a2a2747a95e3733ec5a86236e745c044e8726779253334cdf3ff9fd20c

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