Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ba2ce48cc7fe31…

MALICIOUS

PDF

63.7 KB Created: 2021-09-14 08:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df5b929c1e98c3aae4bc4064a58489d0 SHA-1: 52dbf88255311c35cde882a65ffd43a1ca8f817a SHA-256: 43ba2ce48cc7fe310c5a7fd15166dee0ad4d7a8e6262801abc9f06e8be5e4e5c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to lure users to phishing sites or download further malware. The structure indicates a deliberate attempt to obscure the final destination through multiple redirects.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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://lean-ds.com/upload/editor/file/55904106892.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9526c7913bd30a727650202a09260a1/vikatijezigofidodagu.pdfIn PDF document text
    • http://keitbg.com/images/files/mezenopezuzezamomax.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/ladozitabajix.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/nunifoxakopaxatabem.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/20903288118.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/97414039486.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161379012dc0e7---3789375046.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/dalotarapamumor.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/rudipu.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906044357.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7da92b1e9---31258667476.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tjqhmu4m16b6b27429oitd00h3/pedevelupomivotebunodekoj.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e2c64117---3621479635.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/xakeges.pdfIn PDF document text
    • https://ms2oke.com/contents/files/xaxuz.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/sonisorirepazisetim.pdfIn PDF document text
    • http://yuha.be/_files/file/78540356550.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/76bc976631953dacab3edd60fa918b9a/nitupuvobiwirov.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/85088773417.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905061209248.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/5475228103.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/18533778383.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/77784513959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=john+newlands+contributionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 10784 bytes
SHA-256: 611d07c4e3d00bcf6145fc383e16afd2656cb8c8ef2d2dff9c5c69b1788a6605