Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb92ef0fa04edd20…

MALICIOUS

PDF

55.8 KB Created: 2021-05-29 14:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf7c96398d3c3821f26c9e33969519f9 SHA-1: 900fde67b39d9b7042e75771014f1212010ad243 SHA-256: cb92ef0fa04edd20d94ef09a8a3f5a8b6368ad0671fe0b6647400bd1afc6169e
154 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b7fe7745892ee0f574918824b5f9f56a/vojukowavufosifadoxetolid.pdf
    • http://taiwanglassgroup.cn/userfiles/file/pogukesuzupekepuwunos.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21290a46f---44310974637.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/79a0483dc069e45c94a8438e007e7123/52837120700.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a815bf75515---73670623657.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb53ea7d6---wuzavomusovofozizinobup.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607828c65640c---18035746960.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d1f917776127343150aa7a1f2d04b0e5/nakefukapulotefojekuk.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/vuxakoraxavewilod.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/88i749kdnv31ss3r2vi0r39bgo/texejanemupomaxekinorek.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f093d51b---83855476385.pdf
    • https://mmszke.hu/files/file/satetabivetamudifebidezu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a7895d2b1c3---84458030658.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/safud.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe32777886---11011582844.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/rsst8vjiloilqlhq15e998mv40/jowuxubujamuxole.pdf
    • http://heyumpnd.com/userfiles/file/%5C/sajodofopugelodemuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=starbucks+delivering+customer+service+case+study+summary
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd95.bin
dfc5f09975c4919799091bfef8cf8ca686f38c53c528d52c8b35d98bb0ba08f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD95 5728 bytes

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