Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e1a74bb3c7d6e4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 02:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97cfc84beb0e4d5e9d6bdef2595d2562 SHA-1: c33697561c6ceadeba89ce7282b1f2a47094f49a SHA-256: e1e1a74bb3c7d6e4352fada859c0e9938a2ff8fc50545db0d43f9a11ef5b73ae
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution point for further malicious content. The ML classifier strongly indicates malicious intent, and the presence of a link farm heuristic further supports a campaign aimed at distributing malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://bepcongnghiepphuchung.vn/userfiles/file/67427441716.pdf In PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de67920884a---zuxop.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a88322c3c---29459084077.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/57287323404.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/94503350417.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611466ddc9b8d---jisikemutogakevag.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3cb2cab5---47157601797.pdfIn PDF document text
    • https://anfauglir.com/images/file/54357035996.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/25muedi3rpge31c9oa8o28jkik/laxobodusabotube.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/belujudaviwiwigunukefafo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/31223886757.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/97929091266.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210629173853562502s7j5ex82a9vd.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/xepibavoj.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b0629b9ce1---wutaba.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/vukemojunijijufawojam.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-7-31/20210731175514276418.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/jezivekexoxa.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/4069122323.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0p6qg1qass8217s55ihkencu2s/jevokotadexobupasifofu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kaborujujudusuji.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/zisilubidaka.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/85432992129.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/14461c9cf6a7a7cb59d30c48324336f7/25637595047.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/nironinodozitafisuxilerov.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160986b9ca063a---88570562352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+quran+kareem+pdfPDF 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_off0000dfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 18952 bytes
SHA-256: 6061b8cc48024d70bc8676ebaff11368c38240abfc7674d851d7a3cadb8a256a
font_02_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 10724 bytes
SHA-256: 8e9909c9865cdb0f3fca8834b0716b568dc1836ee9cc3f46f8204a0afd089705

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