Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ecac81de37422…

MALICIOUS

PDF

73.9 KB Created: 2021-05-07 02:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6024cb301f01981df6f8a36fbf7e1df5 SHA-1: 04ebf0a28806d7e0c1e62b23ffd5442ef989fb4b SHA-256: bf9ecac81de37422139c314ead7c0017e47170e2dbdfc46358465cca46fe7faf
154 Risk Score

Malware Insights

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

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 multiple compromised WordPress upload directories and disposable hosting sites, such as 'irlanc.ru' and 'curry-box-deluxe.de'. The document body contains obfuscated text and metadata, suggesting an attempt to disguise its true purpose, which is likely to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://irlanc.ru/uplcv?utm_term=arbaaz+khan+movie
    • http://curry-box-deluxe.de/userfiles/file/43060850689.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/16485954b261e8a9e0120c8a2c343d4d/71954243635.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cba53de6a---kagexazujujekixo.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608364a206716---nusun.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706f4c4cab5---85136773769.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b8fca3655---jogikuvut.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d03c836c4---45776300188.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/602c6ee6ce3a086cda22c05cf99b6b33/xomuju.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/359763da6f42ba772ac8e1e2937d97ea/92513774583.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/6a632038dc12ff2b2cd5821b3bfc0490/jipewelu.pdf
    • http://al-bandak.com/userfiles/file/3614037781.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5d8b7c08621c40695e268004d5771fdc/62985691852.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/bdogmbvn8f9gmd59id9treoei5/nozokobofozosafumoxole.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/u36ph2u9bn6v3hi2q227kdbpeb/zezajijufukid.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0418d8192---16109016997.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_off0000fdfe.bin
238daaabcf9489c8506f44d708c136ce64049530261da827d0e73e23dbee0dab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFE 5020 bytes

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