Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f9e7e6296ec116…

MALICIOUS

PDF

65.3 KB Created: 2021-05-04 11:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37992708cee5a8041662fdfc59f040f8 SHA-1: 67ce5543cdb1ca1e217de94ca723128ead04619d SHA-256: 51f9e7e6296ec116e23715224b970dd92317698651b87e743946cec281a68ea5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7722

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.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608646f62f553---xeletaridepekoluvup.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/30755arlpfo5o10g119do55qcg/55115175217.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c73c8c94b0099fa14cd2abfdbd2f842d/87411566760.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079976650a05---zasasususemuxokubujuxij.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0fce258b94b3f4bc8adfbe178449755e/vipifukukatepulizawudapo.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089b86c19b01---15806095057.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608398dc71a62---6385351832.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vkhr2o4kh7v7t4e1moe4d677rg/51381673458.pdf
    • http://alemotta.com/resources/original/file/97585551197.pdf
    • https://amrapalispot.com/userfiles/file/tarubonufepusetamob.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d56d453dd---88383557612.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/07p1hpt70ftquvgdenmi7r0fps/37790315295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=whatsapp+backup+android+iphone+google+drive
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d6.bin
599fefaca2be3d96ec818f421f075efe0dbd221570cb505602fb9d4d725bf8c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 5612 bytes
font_01_sfnt_off0000e5ef.bin
e85b6a329aa1c4098f56bfaa6e1e432f48aa6fedd46c7e647f23d5ec7e630198		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 10736 bytes

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