Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cc2465c5692739…

MALICIOUS

PDF

64.0 KB Created: 2021-05-03 10:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d770bcdd1a2941c50001d0d207039e8 SHA-1: 496e66ff09bdbaec362e393e07b053ef6d16ed1a SHA-256: 87cc2465c56927391ff2d16675abff47ddd5509604450b66f3ef99bbb63b9a1d
154 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. The document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of multiple URLs hosted on potentially disposable domains further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.plsok.com/wp-content/plugins/super-forms/uploads/php/files/0fd4d684c68d29dc9c0f0a1d71f74c07/xaposaxoseximutusupixuv.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073745448463---83739134615.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/66ac4a2546af6fea79c2239cf97975b8/63087843092.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dda49d8cd---76129342616.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1a39b1278---kidigonepovowu.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e57ba542---mosuxutowokazijasigilo.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087101ca68be---gejurolobekugewuli.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607551281f088---28847990375.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d50ca620aa---18754972364.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071111f60ea4---zemododezimofupom.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rqql2pqine7ljg8drlc686fmqf/89372938938.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607660824ab02---22538217876.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd8596f1d4---64331949676.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608311e3cc010---65572633849.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=acrylic+wifi+professional+free
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf57.bin
dbcc7e989a97f4910f7cc736208f466af84be9fcc4aa1c43841c210c8028cf08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 5192 bytes
font_01_sfnt_off0000e131.bin
d2f19b62b9a43428e9247d504a8abb7a11f01ef863772e9bb092c8d4311f09aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 9940 bytes

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