Malicious PDF — malware analysis report

Static analysis result for SHA-256 648aa40de98ba86e…

MALICIOUS

PDF

66.7 KB Created: 2021-05-20 02:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c22e1affd0f43d2a85ee678b6e342321 SHA-1: 45c124fa9fe1c483e024bfc29de1863264f95d29 SHA-256: 648aa40de98ba86e51a1dc67b14f6f4afe76181c2ad90fbef457701612fa5971
154 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8612

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 http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beaca23ea7---85252628582.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/965942986.pdf
    • https://gbagencement.fr/uploads/file/lakuwiwojapeduzokuzegit.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/320d7d54d0e141a5e856028bebba416e/jumezejimopusotuxugibu.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609402a8721ff---sedevopujov.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b76917fdd---3100254776.pdf
    • http://babamoleskine.com/files/file/nelosusisuwopujadi.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160870def8fef9---4365033691.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ecf37983f7855be6018dfc1b4eced6e1/vigupaf.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c7be60a44f5c471b65927136c8e1b8c6/20620622385.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bceadfb6e7e49bb8f444cf896a24eaae/wisekesil.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/bdcfc120a47562f0a222bcce6187fec3/14151259611.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fcd0a3e8---zojire.pdf
    • https://actorconseil.com/files/file/26607682302.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/56e53f7c2fd4e81cd1fb94a7808ee003/jumap.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfcd39823c---sumepira.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed081c2879---budawaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+does+a+transformer+work+igcse
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d78b.bin
7fb37c1c4f62d68b2c632903fbf44608dbf138fd51ef07cf0795edb6e72d3c76		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 5428 bytes
font_01_sfnt_off0000ea04.bin
d897e3b255545504e632ad8d32a860c7ab43a50a7d0af195c513eb2b2494f73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA04 10108 bytes

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