Malicious PDF — malware analysis report

Static analysis result for SHA-256 50394ed3c3c476b9…

MALICIOUS

PDF

64.0 KB Created: 2021-09-04 15:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b75f774810d775319753bd5e9eb0dcf0 SHA-1: 117727ed5a81b79bc0fc169e7b3791d91fd675bf SHA-256: 50394ed3c3c476b989e3367c42bfe8ef09a6265006937b9ecde5a3a4fd07ac12
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. It contains numerous links to external websites, some of which are hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of PDF_URI and EMBEDDED_URL heuristics indicates that the document is designed to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7837

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://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/75491717685.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c012b8f9840e5ef836cf2182b7869372/zowedefejigevezi.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/63846590761.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/86914900483.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/15497460611.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/60996448835.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/sumamupiloj.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/30409773702.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/815a63ef4ae5ee59a01cc87e9122066b/92687510214.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/36791153208.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5b175b145---55533114818.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/58761323213.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/80132153646.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/joxuxumagoxelofejuba.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cec2715761---85544812415.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/77655e8bf70f8aec43213beaf000ca17/rafudurelezopanaxetesitap.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/1f005ebec38b6f45da821ee657abfe04/24123692476.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/17958200191.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tazapelavunuzufupe.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/86883183112.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/48839306947.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/38058576685.pdfIn PDF document text
    • http://tcihk.com/userfiles/sujojulabazef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=psicomotricidad+gruesa+definicion+pdfPDF 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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 18484 bytes
SHA-256: 59ff78214a6bcccff280841c826d844217a0513e1130301bbdf2e1a518b5d149

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