Malicious PDF — malware analysis report

Static analysis result for SHA-256 9529b5cd510f1d2b…

MALICIOUS

PDF

61.3 KB Created: 2021-05-20 18:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d50727136a04333a8250ad64b469fe1 SHA-1: fb69f9143b4d365f9a8272aa0af3c57e06212928 SHA-256: 9529b5cd510f1d2b09b01ac8ee4e583c248e2931dcffa60cbafb0149934a612c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farm heuristics indicates a redirection mechanism, likely to a secondary malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ae5cee5f3---xozufepu.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094921f8f34d---lepomigekufajib.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210519155950.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088072eaed7a---51173339018.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/5f1febc1a9f79dd769f5fde0c978cd98/44775514126.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/46b499203e072fc06f93e463ef7b9da8/24158839509.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/2m0mo6gkujd1jnah48qf0h467t/3788532330.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/562d895f8ecd38a69246b9e16ba9208a/guxazulojipafupalenina.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/bb56bc1fe25d3c63dafe631ba3b221d3/97971145862.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/pmea2ms6nj8g7pu7lt6f57ha66/59148177317.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9045efe27---tesefilu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160836ab31d96b---19409653322.pdf
    • http://eotp.info/sites/default/files/fck/file/xenegimugasifubij.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606c964021ca1---zazixuba.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d95c75720a---rewegadebovosiluw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=forza+horizon+2+pc+code
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f0.bin
d441893760280031d5fb43c0f95d222a124f52295261a7d05348288e78f03430		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F0 5088 bytes

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