Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d940e2880ac0b4d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-18 13:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 05338e6f8b7af25ed994c79465dc2091 SHA-1: 3475a63d8d36c03eda341cfe0523798caeb9f109 SHA-256: 2d940e2880ac0b4d7ec7703cf0dcbdb06a61ae01a999a04c403f0593006680f8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple external URI heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=remote+control+your+pc+from+android PDF link annotation
    • http://dok-vo.ru/userfiles/file/zuribubudimorij.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/duvimikobeda.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/zidapegavowubesu.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/xujajugavamejemizulimur.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/piled.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/81f1ebb1a588675a5aaa7d92cc1299bc/gobonimavegopi.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/89979452650.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/2134243619.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/5159033000e0bbca293e6c2ada857fcd/32271538760.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140c34a3aa97---22694715591.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c3070889---184864037.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/71980228808.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/bufoxi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/52468815656.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/72735921911.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/72894816392.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/luremufobapepavilodopejal.pdfIn PDF document text
    • http://huntland.hu/upload/file/wekaxutuvefa.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/78471058658.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vaxomonarenipuzib.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/90622326192.pdfIn PDF document text
    • https://12shio1.com/contents/files/ruxivuxeku.pdfIn PDF document text
    • http://gtshotel.it/images/file/setoxilenasalira.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kukizekebaterasirekux.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_off0000e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE457 10872 bytes
SHA-256: 1b9b6e99d1c273de8edaa4bcd176aa1362b062c0c3b8291e31560ba467fce3b7
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11589 17892 bytes
SHA-256: f9063fbe149d4f85f661337fbdab8d222c718d19d187f31a34e711e5b9fcf8de