Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ad6283001751cf2…

MALICIOUS

PDF

81.6 KB Created: 2021-10-05 22:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d618f2ab15fc0ce2ecf19d63b9cdbf38 SHA-1: 52b458c012c4fd3d70cd09835c0257374bf69860 SHA-256: 3ad6283001751cf21c5de813178233709b5b09672a5fdbdf4028133bda8ab74f
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and numerous external links suggest the PDF is intended to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=ratio+and+scale+factor PDF link annotation
    • http://mudrkanuch.sk/editor_uploads/system/files/50215416266.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7f94a8f15---99396609385.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/61542735999.pdfIn PDF document text
    • http://ned.ru/uploads/files/46578642517.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/99495585583.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1615954ce414ae---58529918041.pdfPDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518998bbb2e---51318833353.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/pebinanozupika.pdfIn PDF document text
    • http://chieucoingason.vn/files/zekapozog.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/pabulivuvixorukozope.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/6245200662.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57673339061.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/76505372402.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161448bb029d62---53480547610.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/laxatezeruj.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/rukajekanidu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/nonigebotijuwasotiz.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/14093705149.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202110010431461164.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161569b51570aa---pababixosib.pdfIn PDF document text
    • http://unseretochter.com/images/file/48101870519.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/95357197595.pdfIn PDF document text
    • http://minhanh.com/files/56998931822.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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 10512 bytes
SHA-256: bccf7740af89e663b065a42426230025d73d4d7839cf25d873c68d552df1cea8
font_01_sfnt_off0000f0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 18308 bytes
SHA-256: 579dd738229a8c2c1b4aed9b09a553badff66b043ac0c1c1bd7ea0284a060f96