Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b662dee7b5cac6…

MALICIOUS

PDF

65.1 KB Created: 2021-05-27 21:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 578fcb710ee705f34324000157b049f3 SHA-1: 1bba692c4ff708295b9c43c0695a88dcd389eb16 SHA-256: 12b662dee7b5cac67c5756bd67b3e9560cdd1d659b9e78589b2a2a6d775e091f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure and embedded URLs are sufficient indicators of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+program+a+chamberlain+953estd+remote
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609058d441289---bizuvibotuwutez.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4c2b3a6a4---90901252511.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608068a2ea089---59990945685.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2da104030c---29204940953.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607e127bdec7a---84121461777.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/iqa1fcouh529c9dn3mv7gl6fd1/41865489554.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bbef23ba4---56909975007.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eac00a1b8dde15b8c39366aa736b509/nodizitawawenadilejolik.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/24a8ffa1cf7aa2e5c5514a93c2081a52/20825774582.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9b8ea5c80d023b77f5bc957b205a2e4/14416765723.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/j299vfvqk73r5g9rikn9mnm8u6/velifodirefesarudiwutu.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c89da9d1ce---42319965191.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eead83d391---55694510246.pdf
    • http://soupworld.de/upload/file/96120554850.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099978281f45---34403079594.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_off0000d969.bin
53e5549dc75dba48580b0e9e288d61715b94957fd3694790cdf5a0cd6fbe143a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 6124 bytes

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