Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c59867f894b9d24…

MALICIOUS

PDF

73.8 KB Created: 2021-09-11 04:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 58ed4d5fdf3e81ea3a17b7a66b60f079 SHA-1: bf34ed9250ba2bab8d4a40d9ca47eac45f9cc629 SHA-256: 6c59867f894b9d24a3fa10ab95ba4d00dfb6ebdb0db64e128b2312f4638f4179
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. The presence of external URIs and link farms points towards an attempt to lead the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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
  • 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 http://labradory.pl/file/96378249670.pdf In PDF document text
    • http://alemotta.com/resources/original/file/ririnalebefuliredik.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/56728080341.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/75748836811.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/tibadu.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/xusedurodaj.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/mitigiribekavalumovutul.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/77028226291.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/wofudirateparekijebupew.pdfIn PDF document text
    • https://primer-spb.ru/files/files/wakirotefaseso.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/21426574424.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/35919976554.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/28431079721.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/pajufosebamiletupasibe.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/rejemufatiniwirob.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/85959205471.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139615d9c16f---87932120293.pdfIn PDF document text
    • http://bresky.cz/res/file/4444793540.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/22528151729.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3f912a343---nabete.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/22011120868.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/webazunikifuwotelivomo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31a33c705---tiluwofozubitovotugata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=autobot+minecraft+hackPDF link annotation
    • 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_off0000bea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEA5 16624 bytes
SHA-256: 19d4540abeae060e0d21965bf5833437d4b5e61bb9fd2b178e24afb93e6d55d9
font_01_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10700 bytes
SHA-256: 6538472d82b413b4a821b2d5b5bc6736c4de1cf613b108f683158cf800d31594

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