Malicious PDF — malware analysis report

Static analysis result for SHA-256 3365a59647e95757…

MALICIOUS

PDF

72.9 KB Created: 2021-09-14 20:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b970af23f3958321ce538e974846180 SHA-1: 85ad625adba024aeda5f4ca84b9a6d70b92a8a8b SHA-256: 3365a59647e95757d42be51092799f4253b9c1ed81499a1020d1654dc8c391ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript further supports the potential for malicious code execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://oniceh.ru/uplcv?utm_term=prove+compound+angle+formula PDF link annotation
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/zopudixakezi.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/4d1633e1c7af9d272675526a89b2b2a8/rodavelaviwufez.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/76742940953.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109012334359410.pdfIn PDF document text
    • http://esistore.de/userfiles/file/puvoxozegowefesal.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/dakelowivawabubeloput.pdfIn PDF document text
    • http://effektfilm.de/files/file/bitob.pdfIn PDF document text
    • http://czyxchem.com/upload/files/79645146532.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/94732827650.pdfIn PDF document text
    • https://ismart99.net/upload/files/bukapurivorixavi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f5af8ac3racd22mj9ijh73rre4/zopedusunixosewo.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/maxufibozosurixutuk.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/22543459432.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/nivubekomaxipodo.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/52393937680.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210914070213112551.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/4788802312.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/9828014847.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130364124d45---tadoxejixudolezikudato.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/vakub.pdfIn PDF document text
    • http://lovesenergy.nl/file/22259095854.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/pataf.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/53247554568.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/75643009246.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/7776452393.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/11191603444.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/pilisamusexuxujanusefa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 16488 bytes
SHA-256: 1033a451272a126acc0c91480214e724be07c1c7976d03f3f0ee054bd74433fb
font_01_sfnt_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8E 10772 bytes
SHA-256: ce4fc7dfc8d578437c6e3ecbf0caecdaab238bc9133a2038eece123436e0a9dc

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