Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0eb8aef6519096…

MALICIOUS

PDF

95.8 KB Created: 2021-06-11 11:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 169c9be97e41246c101ad1d1f16d8112 SHA-1: 152b85c72de05cd2337df524d8c54556ab787e99 SHA-256: ad0eb8aef6519096ba559c141671a1a5385e693b4e5f3b89cfc2f8128ab97a07
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 an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various compromised WordPress upload directories and disposable hosting sites, likely to facilitate the download of further malicious payloads. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8116

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://medvor.ru/uplcv?utm_term=dragon+ball+z+episodes+tamil+dubbed+free+download
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/2668996164cc34fc2e77cbf72e9a05c0/68404822312.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/2532905956.pdf
    • http://przychodnia-felinskiego.pl/uploads/editor/file/723243829.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa434acd9a0---62860549911.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/318f60be6a085be42cf487d8f2d3e282/sitegoko.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9bbc2e32---remeguwusat.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d092c342---67991152526.pdf
    • http://adance0112.com/upfile/editor/file/40393486142.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/e7nqlhl1mvkhu00u68330r0bek/wunekikotulemunuw.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5d9e1d9869611ace227f68fc8b3b0aea/pemebopigizoxafapuwepam.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7c348f7012086bc2e74b7c2c432a9b47/xadivexovivemopudelodoga.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4583a30820974f6094f1a5f0438a0928/61116551390.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5bbc5af0---woganodojekuzufuze.pdf
    • http://colorfulmedia.de/fotki/fotki/file/dadibunobukupe.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e72fc55b6e804559cd65841aee9e1ced/64590568459.pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c82.bin
63ebf3db744b3fbd1d7595ac3c02dc14b888da3537a115583645be00fd1ea4bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 25692 bytes

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