Malicious PDF — malware analysis report

Static analysis result for SHA-256 c437291db3338c48…

MALICIOUS

PDF

73.4 KB Created: 2021-07-29 22:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ac950f8422322b28918a46b49ba1f05 SHA-1: 6fdd507dc5061c9604ed1a9fdc2c29764b65bac0 SHA-256: c437291db3338c480de028b3868e1061ca98f41214a539b346ee4ded5ff0f522
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. Static analysis revealed multiple links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9720

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ulfqahc3d1t6419t9ljpehekpb/fasuxuzokevirelujonozif.pdf In PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c6682b41d---pixeteperodemudubodaweko.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/lukubezi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92b46650b---15740602296.pdfIn PDF document text
    • https://davaocarrental.com/images/file/jezezixifemutorafon.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a37132d2c4a---69224471251.pdfIn PDF document text
    • http://chineseclothingonline.net/File/kazakimuvewota.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ebd7d5d52---dezegikemo.pdfIn PDF document text
    • https://stopserv.ru/files/file/33925347506.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3d155932d---gejasigalinigidilo.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/e9bc1759745afccda3d81173e12c6c55/9944808855.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0015076a3822745de40fc12440749885/kiworidan.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9b5d9bcd682daf12a7372716d78d8ea3/37346006493.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/fadevonevemodapapo.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210704112244.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/ibkjvtccjec2vudr0fdpr4igcj/wiremupawow.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/26031982792.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ff550c23---29890482803.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/25604234915.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/56991435795.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • https://aedwea.com/upload/foto/pasukapifanakewejutunabu.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1rpbklailrv5nrnok0a95bgbkr/7195041631.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/vasuxonewujarovufuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+is+dunite+unique+on+the+scheme+for+igneous+rock+identification+chartPDF 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_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 11292 bytes
SHA-256: cccda1761518ef2baa5b158e1489a75922111012f5d70b7ec32c7dd3f2d9717b