Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b82fe89080f5d66…

MALICIOUS

PDF

63.6 KB Created: 2021-09-05 15:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5a6029a915a1e3fdfa411bd8d3f16831 SHA-1: 64d35618bde92d3ba8699250f7ee4bf90a5f8752 SHA-256: 6b82fe89080f5d6660fa202a2d0503924a4240aefac2df53dd5dc700a73d73e3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as link farms. These links likely serve to obscure the ultimate destination and potentially distribute further malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9212

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd78e6db62e---28857377348.pdf In PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/kogaboxakevamo.pdfIn PDF document text
    • http://aviseco.ro/userfiles/file/41125473414.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/sudiwejamoziniwafav.pdfIn PDF document text
    • http://360mart.net/uploads/files/nowivuj.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b0f328cc2aae88241bed796a24ac476c/nexefiramoruposinogipov.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/rofojamokulapurigisenasot.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3pnd24ldb4gjoob4rkar7r0712/16768772924.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/78442013592.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/dijiroza.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/52081475790.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/149463cf78a799ad6deeba5ab60c5914/ravajijakafamer.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/63401220197.pdfIn PDF document text
    • http://boxethai38.comupload/file/59132412001.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/73415896976.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/mejexetivorabifamasoxoli.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719bc109956---ledepiduwakibude.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/10542832749.pdfIn PDF document text
    • http://wallacewilliamsfamilyreunion.net/clients/6/66/662ca4338cd1fa41fa93b88222973dc6/File/belaxoluvijozubudaxejuj.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/688729facd2352f7c79156b91452a006/92133735329.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/waviz.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09be8d75c---42499303447.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/72857031457.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819431e3c64---gigog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=copy+table+from+pdf+to+excelPDF link annotation
    • 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_off0000db44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB44 10804 bytes
SHA-256: 6a440b80dd18cddd6aa8b38e6085549a755b7c10b50bad13857853f6d54f1c75

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