Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a359f664dba3d7b…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 13:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 733aa889891f1ade2f32591fad4095fd SHA-1: 0046db94eee4e2c704ef96530ff9a89c9da3e253 SHA-256: 2a359f664dba3d7b93c9f51d52c7096ba0dba4c78fc65217ca3d7afacc076adb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

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://wastran.ru/uplcv?utm_term=share+files+over+wifi+windows+10+and+android PDF link annotation
    • https://ostrichtours.com/ckfinder/userfiles/files/32328990549.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/85826950679.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/xuwoguvadawarawizen.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jozarovemu.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/29274612029.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/midabunorozekitof.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/79217961683.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/14431059700.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/54456761458.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/geron.pdfIn PDF document text
    • http://cityfate.com/files/files/39703196142.pdfIn PDF document text
    • http://czminghe.com/upload/files/56562344585.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/kunanadaridonibapuburin.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/kopanasuxuwilozaxufe.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/22804702889.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/5bo9bi0r6qqplogvensin4chf6/52877268241.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7d82fa6a31d9df004c5b46c61cd65d92/bepiko.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308d57c4e19---57936280321.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/pewuzakaxodizonepoxovuxo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/poridosejezonigekosa.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/zufolesijizaxopi.pdfIn PDF document text
    • https://longhoang.vn/upload/files/32204488739.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 19568 bytes
SHA-256: 3dac298f247911627b9a036ea4f91b00a99d6a9a1a9afc361ae9d3fd748974cd

Open this report in the interactive analyzer, or submit your own file for analysis.