Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4458c6d5765c5b0…

MALICIOUS

PDF

119.5 KB Created: 2021-05-22 02:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e61a7110e183646f627d8fc5f575d90 SHA-1: 3ca3865b17ea43b734dc9569f588435a730908af SHA-256: c4458c6d5765c5b04ec9dec9a7c319f9e39946fd3fa2c014feb7d1154ca164c2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of formcraft plugin uploads suggest an attempt to obscure the true destination and leverage vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9638

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://oniceh.ru/uplcv?utm_term=applied+statistics+in+business+and+economics+5th+edition+answers
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ca6824c93---95288584479.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c765997bc9---93793169401.pdf
    • http://huile-de-nigelle.info/userfiles/file/zitawum.pdf
    • http://proxima-design.cz/files/file/nuwojajorulabo.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6714eb8bec270612b49947b4dc939b2e/zukizelu.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608049ec35145---96629981594.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5t4cc4mdc1hpg6qq4rhdeas4l6/zator.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72908a285---kofuvobakaxagifomapojewur.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/kfqoc3jjrjkajf7pit5i841u7k/jurujezipaxotogemiruga.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/8948c8fcd1eeaf11f765f2892f65a2a5/linesejuko.pdf
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zogulumomofukesivuxo.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8040c908951f324a4cd57f470681481e/ruwilipusapomebavil.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/458ij842ru2mutkqvjc6d8i5dt/nudefipewifujur.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/8390dda8eb35ba0bee84c8c425d80b45/bodijoxodugizixa.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9cf35ebb---55435226620.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609001b9efe27---pelopezab.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_off0001c495.bin
5cc53bc42ba73982676353e8d0f7e4e7091440e6c12c2888a07639e934af6ad3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C495 5660 bytes

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