Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9e2b9fd62f80377…

MALICIOUS

PDF

86.5 KB Created: 2021-07-30 14:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88c7c9ee8c90981219d34ca0f9361005 SHA-1: f9d5378ea11bb9fe2fbe84fb79269a7c92f85fe8 SHA-256: d9e2b9fd62f80377150ab75f943b10f3f336c13231aa9dfd888cf0ef61d9d790
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which are associated with compromised WordPress uploads, suggesting an attempt to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607706d6699f7---19172755301.pdf In PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/gopamoxa.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/16/niguvamujuluvalosawigin.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3861ccf04db9d2c21e56aee516a2361/51417911432.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210517015535.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/37272941009.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608231117985196.pdfIn PDF document text
    • http://cmtsport.com/pliki/kelakumovasufumuv.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/46917044106.pdfIn PDF document text
    • https://clinicaveterinariacabianca.it/file/32169608656.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/36019562921.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e0c7dc11c5537de11ee890fe6462e98c/58480984930.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b76a2034---62271809103.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/43046626400.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/80160210783.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/xenodesa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd598c599d---77776380992.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/ziweredazisemadexonexo.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/55786827111.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/mazugefojutezok.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29a9b21333---56068057101.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce66751662---rijolusev.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kexag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+workout+routine+for+beginnersPDF 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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10652 bytes
SHA-256: 403bb9ffd5fcf96686a7888d1fdd8cb7be722f735776423c2e0b839f779b44cc
font_02_sfnt_off00011e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6E 17328 bytes
SHA-256: c8453b3d18fec64824ab8a1dbdde6f4c0bd21f0221735ff8e4613645e94d6af9

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