Malicious PDF — malware analysis report

Static analysis result for SHA-256 3981ea26ead678ae…

MALICIOUS

PDF

110.5 KB Created: 2021-06-17 14:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 255a019a8f9532db028047940fd15afa SHA-1: 28cde9ad8c4895095801959f49b4e53ef42e81ce SHA-256: 3981ea26ead678ae7ac4b89aa7d38a489c0de6998a3d022061aaf9720aa35e19
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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://cructi.ru/uplcv?utm_term=ayatul+kursi+surah+english
    • http://csptech.net/admin/userfiles/file/99746466482.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/21430cc05601fc9458d912be196bdc25/37799676397.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57872f474---50969717628.pdf
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/cn1lfpe054pn8vf33l2iumut72/fabanetipamokure.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/993b910f0def1f386474ebe196f4565d/42752040998.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/95faa3se8jj9tpdual55j8lm66/dibewimegotofomebodifuve.pdf
    • https://soudurelauziere.com/upload/editor/file/jinapavuwejekex.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/32b5ca30fdd9830ff31a850b1e5e8bb8/jeguvawarinatevawipogi.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5be27be0c---21933651075.pdf
    • http://dlt-nkp.com/fileupload//file/wikoximoz.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160873ddcd0d1f---63226951675.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea69840d3---fofujakoje.pdf
    • http://mikailang.net/userfiles/file/20210518235134_99231057.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920ef632dca---vuzenonafosuzabatu.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2518a8040a5551892db8336675779253/buzomavomokesuzer.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160839b377fbd9---vadinubopupalofe.pdf
    • http://atthaya.com/file_media/file_image/file/57398511350.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019143.bin
b4195cda156e315fc49ce5736694ad234cb416a6b3f59808b69e01629f0ae92f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19143 5104 bytes

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