Malicious PDF — malware analysis report

Static analysis result for SHA-256 062cf9efa9e44ac4…

MALICIOUS

PDF

69.2 KB Created: 2021-10-08 02:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: da70b2f40a6dafbf92b4da8fdf35acfd SHA-1: 4a01223a28af80b75296f581798c79c650631edc SHA-256: 062cf9efa9e44ac43ccbbaf0da423bba7ffc8e92a7f7e036a53418ee45fddc1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6340

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/10a54fe8f1c01499fda4003bfbf5bc4d/97207897453.pdf In PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/gumewujob.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16149a71220e61---lavavidegipafuz.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/giden.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/fikabofigen.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fibozokusoliwakelofoz.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/87486255891.pdfIn PDF document text
    • https://stvorki.ru/files/file/bivare.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/64927475675.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/pejovugokajukapiki.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/56530159511.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16149d1b1616ba---99924987369.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/gomepedenutoj.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/nujanatunokobimu.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/99943015795.pdfIn PDF document text
    • http://trivio.it/userfiles/files/71930345017.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/56050128088.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/30932584631.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/72577697592.pdfIn PDF document text
    • http://sdds.be/userfiles/file/77847974690.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109111254008115.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/bikoluvibovuj.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/kamamajovi.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/38559151564.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/tamise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=moonstone+and+garnet+together+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1B 15448 bytes
SHA-256: d78b5dae1fa71f171b73128a17d620c992d7294cfc6e30bb276bd1b10bb26ffd
font_01_sfnt_off0000e070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10640 bytes
SHA-256: c5510f06e74cbf0c9b67c9a0e38412780a1805bf018a13c9530a62a6f42f5e8a