Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db40f03f10c6b23…

MALICIOUS

PDF

83.9 KB Created: 2021-09-16 00:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 436355da416b70fc9cc351f5d28d03de SHA-1: a22c008a723e86733a580a9f8a33f8ce6186981f SHA-256: 6db40f03f10c6b239838500f431700a2a3f579ef3425575a9b1c43f8509545d4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to or download further payloads from the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 http://langmoon.jp/js/upload/files/wajivujalado.pdf In PDF document text
    • https://bloomeng.com/uploads/zimuzijuji.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/wutub.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/vewezivifadakelezabulaj.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/52124792219.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109131306402676.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/83034369057.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6057da7f4b12bf65184caa83a4357c43/nivevefunativij.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613235ac81f8c---votewa.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/b9f212d17acf3437744b4bce2daeebf0/fidokokowuwanikaduj.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/96324435026.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161356a27e0dd5---fotidilujoxerodojen.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kozevidisoxorovosapo.pdfIn PDF document text
    • https://italvaping.com/file/tivubogejura.pdfIn PDF document text
    • https://susta.vn/userfiles/file/60132283179.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/65438675972.pdfIn PDF document text
    • http://belean.pl/userfiles/file/tixekoz.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/53244168487.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c69a3a431---73379683725.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132bbf6bb4b9---wunugufuzi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/gigomejaxezokula.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/sowul.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/57802888056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+many+android+devices+in+the+worldPDF 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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 17908 bytes
SHA-256: 62dd68d284aa5a7d5a27b6bb87bd4ecdba5e050f1d66107fb84d7fd2d62bbb93
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 10892 bytes
SHA-256: 987b93b9c69b5ffd58746f11ff2c4451c7ccae40a84e9ff4abcf91cbf99f2546

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