Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4a7918efd5dfa0…

MALICIOUS

PDF

65.1 KB Created: 2021-06-20 01:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2e2aaf0ea4d4fb2a1aeabab2b03df852 SHA-1: c60dd2fe867949b0aa8d85e43002f85c098d472a SHA-256: 8b4a7918efd5dfa0f330657c182f09355f7be7f912d7be66bcbb4dc840a3867c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8125

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 http://teormech.ru/teormech/usrimg/file/95400271559.pdf In PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/49a58edeab516fb1c1372a1ed6f87d4f/dizoperefavimew.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/webiragapowefufofasaleb.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6098e381d---vepemumoxeferifire.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4611f76cbc---51205839309.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c400f1d6f895a4f2c4142cea47550463/57390331356.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/xabumawikoxepo.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/91371163750.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070646ab29da---rodadasulel.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd15fb58e07---jepujewofab.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/82105726201.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/28681727585.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608150a8b5025---21044104763.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/6470920058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=samurai+and+knights+dbq+essayPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 5740 bytes
SHA-256: eb86ee4810bbb2624e8ec1f9aa2b1d718ed6e5596cc23e259d1ff3489bf12ce1

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