Malicious PDF — malware analysis report

Static analysis result for SHA-256 3584f9bcdf293c34…

MALICIOUS

PDF

83.4 KB Created: 2021-09-06 23:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93343b6cd24a1d17893ff6890bfb4497 SHA-1: 445486c55d50fd448f87bae9159ff14419321e04 SHA-256: 3584f9bcdf293c349dc113c1742ef301ccedaf7973d17a1f27e582a6944cbe69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristic firings indicate the PDF acts as a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. ClamAV also identified this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://hagakure.by/upload/editor/files/bobereja.pdf In PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c97c62fbb---mizewe.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/43272735935.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073c7ccdb9b6---91795810809.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/37047694213.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/rewuto.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160842fba5d559---30986043046.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/07a195244d6f7212fd26d5550e7d5606/40436109049.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/6ubrg09map4lit7g2i9h47b7g9/73074064335.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607361a362d91---88449099448.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/85247051994.pdfIn PDF document text
    • https://arendic.cl/files/kofeke.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/81771533952.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f39ba4f7e---ladadediritedozepi.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/peduvepenibazoxomo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/dde99f3844a01e59331d80d10cb3d353/67291520363.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608012858d86e---rofixiruluvejinavowigeki.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/patuvigifesonotonax.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f996ed800---sekezifekak.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ba2bb5d4b---lorisitipivegobusapo.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/72285015233.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/55762733971.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/77364039065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=circular+motion+centripetal+force+worksheetPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1ca388c8dc321e0c228f2e3181a72728/9996471007.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_off0000dfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE3 11056 bytes
SHA-256: 0d1e145b90cdde3c62623b899ff3c34d572ebefe1bf9c535125bda79e8904316
font_01_sfnt_off0000f982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 17620 bytes
SHA-256: ae28b9559f1c478ef6aa877350f26e5a48ec560f555df511f02c3ab18fafe584
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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