Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efac033e814a5ad…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c24a6a5418b44f23cb5e961de87cbe0 SHA-1: 093c78bc30e54d8d41a70893540c1ad8c8e56a99 SHA-256: 3efac033e814a5ad68f971633d9c12a4ea58615cab0d1b6d7793da2dc85a5a7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://crewmak.ru/uplcv?utm_term=tank+game+apk PDF link annotation
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133eb05123b9---pakeroro.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/41959047810.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/jozeb.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/sajez.pdfIn PDF document text
    • http://jingkangchem.com/upload/files/vowete.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/wiwerog.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/7h6jduvfs1ogj5056njbog5df6/55968169285.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zelijobim.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb741a735---45594187315.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gupibikifurijajeko.pdfIn PDF document text
    • https://hsse.cl/files/34979586282.pdfIn PDF document text
    • http://silver1979.com/upload/file/logexizofemaw.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/somofozibabesagen.pdfIn PDF document text
    • https://hgb.se/filer/file/kefaguzeda.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/21969838408.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394cd342a---44270594440.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/31394741800.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/wodar.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/99450788176.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/gonadabifawefajufi.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/47520538992.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/59481703349.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/87945098415.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-12/20210912111236598242.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_off0000d40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40A 18764 bytes
SHA-256: abac42490b29a6aafd91b3ec4e4ee6dc2339a689221a3041f710c54ae05ab722
font_01_sfnt_off0001053c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10028 bytes
SHA-256: a39c385fd4b62875294a9a9f406b3da4485850be1f9477161e9bc3e543e7e56f