Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaf10552b398f67…

MALICIOUS

PDF

78.1 KB Created: 2021-07-21 00:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 119381372f1e57718d64bcc7b6cf0964 SHA-1: efc9f582b446c8ec1dc4a5188ac15e99ac5d2043 SHA-256: bcaf10552b398f6764e17efc5f1af3fafa43a1bc8728b69518e4352dbdf1b853
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external URIs and a link farm structure strongly suggests a malicious intent to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6147

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 https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/7mv9fjecpcnlicm8h954i4lho0/vevokewujalilix.pdf In PDF document text
    • https://huanghecables.com/d/files/25303974518.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/zasabuwigukeju.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/lezawuxoxil.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/rexorotezo.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/gosadesobubuxoligelejufoj.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rezuzasonamasatumumewu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609814c041f52---57046457014.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/lobuvegujakaf.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/8trd2ai11hhmfelav9g057e2r7/13395579309.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2hvdem1njpqrg049nd805i1196/dasoxisotefutaf.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/zemetowadobewi.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967cc5c35da---95931348284.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/us88vn4svidpm0tppk45seo421/29179936945.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d19b5932049---zibexa.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160902b46cdeef---kowozeparivutomeset.pdfIn PDF document text
    • https://lesura.net/userfiles/file/93077194485.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/30613a28b3a5a07e02e6fbc39d8c383b/manejiwizuzodazulitujuku.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/pesatalemepakutuneboziv.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3d05304481---kikafovutowopenadugog.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/gesijonogokuzuze.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/vupez.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kofoponojiwadoborosodefos.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f67681b0---nuxirijobikupikodado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+say+say+in+spanishPDF 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_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 18256 bytes
SHA-256: 27814f3f15222402f1d9fe62ee6e82cbcdb5d11e9c1d3b40e699d556e47e4109

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