Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac1ef9600bad03b…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 21:38:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df7fea8a9dba0c055fab94de5db3be4d SHA-1: 42fa67f830e54174e8b29b8be5c82e6ce6badcaa SHA-256: 8ac1ef9600bad03b37cf88f68fd12281aa9da4d5698874e694fd05dc833db457
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to disposable hosting and compromised CMS upload storage. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3887

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 http://kimyasaldubeller.com/upload/ckfinder/files/fasanosew.pdf In PDF document text
    • http://www.sealjet.mn/pictures/files/fenadalonepadas.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/poximikuzadibojenomes.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/56088412583.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086069e86a32---vavodijuxoro.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2089937d19---98878643887.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f179e6263c---patiwumomivemakuniw.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/14333870723.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qhl2fl2reaqpk3qiud489ciip6/totofepikukuweg.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/mazitijevawakozibijigax.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/15943138989.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/13443526611.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/8726eaa57d5b757b9b26316fa4fd7ff6/95212424222.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a746a989b78---78574358945.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/4aff50a3f52053526dc40429f826d1ef/maruwuwutebuxadobipes.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tg50docegpllf3mkeoi1mfk04p/25532086800.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f3eb4de8---kakobi.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/65001915154.pdfIn PDF document text
    • http://eternaseguros.net/files/files/tiwowiwiwup.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160836686945c0---83671232601.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/79724147224.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b61952849---4462259143.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/60659440556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bipap+mode+pdfPDF 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_off0000c88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88F 16204 bytes
SHA-256: c22e55149c85bc86a1323027fb7e6ccea7b7f613c8052f9a9db4aa1b968bf110
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 19996 bytes
SHA-256: ee2b4911996e06cff4dee8ff8797ac4c9b0ef6ca765d0b74370c46e49140d4e8
font_02_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 10196 bytes
SHA-256: 9ae2cbd5696de567e8fa5882b0ec583765df3e2ca2aeb04f6b588aef617a6e69