Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbda3e353b293f91…

MALICIOUS

PDF

59.5 KB Created: 2021-10-01 17:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee1db4d951d25e4aebf5da1e3299e146 SHA-1: 9feacbed7994d1f81643e142ee0399e022a04941 SHA-256: bbda3e353b293f91efd9721eda1da4fa914a5152e9fc35af62c74570fd4f3d24
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content, possibly disguised as movie downloads. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5954

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161369a59ba119---67893866071.pdf In PDF document text
    • http://exteractif.fr/pictures/2/90006353766.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/40016043892.pdfIn PDF document text
    • https://jjpremiers.com/files/rifovujidezizujulizawa.pdfIn PDF document text
    • https://tavio.ru/files/file/58881958649.pdfIn PDF document text
    • https://thehealerspoint.in/admin/userfiles/file/5217803682.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143af8b32a79---7905628831.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xatokutamipederos.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/81163410402.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/jurugavi.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/vulufafuwejofamigibarives.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6pignqmsj8v4lla3pit08iee7a/55754200990.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/tekuka.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142541e82bd2---vapeso.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/26857624112.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/59370459216.pdfIn PDF document text
    • http://pmke.cz/pictures/files/kejitagepugabatavabonu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/93b46c79e10a740d121fa9a1077c7814/solifemurib.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a6dd83372---95659289885.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b9585fcd---wavudazovol.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/80922084546.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/73373736760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+conjuring+1+movie+downloadPDF 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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 10948 bytes
SHA-256: 1bb50ca7cfc24b7885b9cd232c54cb435e9105a478ac8809b31d7687e2ffb9bf
font_01_sfnt_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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