Malicious PDF — malware analysis report

Static analysis result for SHA-256 046d46c250b49f0d…

MALICIOUS

PDF

87.3 KB Created: 2021-08-10 15:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 316551782c968a76cd0720ee1dd28f6f SHA-1: 59bf94adff1923fbc5b266c78a8ca1bf921abc09 SHA-256: 046d46c250b49f0d5e5fccd68fd0fbc81c8b81b6b69e099153db79e98159345c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was detected as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9090

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://produktybhp.pl/pliki_user/File/58127707073.pdf In PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100bffd2e3f0---35749213774.pdfIn PDF document text
    • http://fittbike.hu/files/file/80117833883.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/jomoxeletimewusomobokop.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d0e6304a8---10439034487.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e5ea28c---fuxaguwivunasipevubeg.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/39752459112.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/17095818886.pdfIn PDF document text
    • https://clinicscrm.com/img/files/43967128052.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160fa737173a44---faguk.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/41368844663.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tarigozujoruf.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fiziwesoxolamorapuxofa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96c4a7ac5f---27729097456.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mobokubofapotisibexoraruw.pdfIn PDF document text
    • https://alutat.com/data/file/95196036133.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec417feeb92---duwalatizede.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/717e9eade714b909868b30c7e6994b37/19825602046.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4fe07fad414f202ac537a607d0e202b8/20492670954.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/jigise.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kamufimejisufenu.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/18678526332.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k8fmeditr84cq3cdar9kodakna/38625914849.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/kurokebinom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=approaching+zanzibar+script+pdfPDF 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_off0001134c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 20056 bytes
SHA-256: 737079e6a679ec4921918f7f26f403e586424d547caf4861eb07a1c4dc9104e1

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