Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28e76a99b6e671b…

MALICIOUS

PDF

57.4 KB Created: 2021-05-31 14:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9c33a76e7f6a5b8f626ae98d055c78 SHA-1: 1546de1cccb5655784ccc2bc3a915faecc83e5c2 SHA-256: c28e76a99b6e671b245e33822821a073d40f928eeaaf5e118e16664398947b15
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8092

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.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/97ae31adf984d66180b60ff34e149c9b/bujudatoramodoxiworaso.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761ceebded8---31595329573.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/tdtf326sg4u5n18kdcbeue386m/xukagoka.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/0fc1fb13b68374d8a94e1e943d47b131/23492332526.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/2d927275fe00a7d5dbc77a477c72282c/41272712703.pdf
    • http://kotolantopeni.cz/file/xunimenafufolepofew.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/be1f4a984887c5cef8790e1dd7586eb9/fetuzixo.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb0ff24211---53706150869.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607157c443f6a---mapusunera.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/7841b681686be75f74edc9f542b6c411/79191058703.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/20d4ecdfcd0b7d8a74c6c987cb0e770e/zedamawowonozi.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089ceb8e6c67---jafamureji.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/133e3f5fc4dda70db834d6be17ee8737/rejexatefi.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985ff11447e---wokulomegatatug.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+you+import+sketchup+file+into+rhino
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d749.bin
83c595d11e238d66b254f5787b087defa8fa2dc621ba8ebc33db941e089d1ef7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 5328 bytes

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