Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e6ee3fa2c6fc00…

MALICIOUS

PDF

66.5 KB Created: 2021-06-23 11:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e8838af7d5c06ac610acbea6f84259c0 SHA-1: e893fc59d90c2d89be62c8b71021ae3e88308722 SHA-256: 85e6ee3fa2c6fc005e1ce56f4f89efecc97b590994b45d2e7724254d90e303f2
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attack pattern involving the exploitation of user trust to lead them to further stages of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8519

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://dzstock.com/Upfiles/file/leperitan.pdf In PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/f9d2c9eaddb22956c47a91847fc5eefc/48636305724.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815ee4482c---sutezivisulegakat.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b56884ee---28292975122.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ce050ec1---65929800061.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/43871063318.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210612_071017.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5fd0b958d36744316eb6b7aa2d072bc6/pebow.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/84750249392.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e2eba76fc6c03302583d8b97549bd24b/bapofobeveladikonufat.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/piwixefizupudinur.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/jodizofowazepotexu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8j0cjoil4lljb8mjtunacn59v6/posod.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/15e13002c86fbb50f35a826aecd2f41a/todelusejanam.pdfIn PDF document text
    • http://innotack.com/userfiles/files/pukuvesizudosavi.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/YTWXjIUwRh0/uplcv?utm_term=alagu+kutty+chellam+cut+song+mp3PDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD431 5568 bytes
SHA-256: bcd0e87b73a42ca0f0108bc76f56ce8e00dadb5f503e4fd260cb49090df97f0b
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 11424 bytes
SHA-256: bd4283d5f6e02da539d3eda7503a56bdbac2abfd1cb4fbb67d2d8e3654bfd27b

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