Malicious PDF — malware analysis report

Static analysis result for SHA-256 d036ad7e37907b36…

MALICIOUS

PDF

101.1 KB Created: 2021-07-05 14:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0ddd7074f5e844c8658161f0473e6cd1 SHA-1: c4fb05257f44e63063a87f711efc84a8238f5036 SHA-256: d036ad7e37907b36b33a795ac58f85d535595851f0428793a44fc430555c47ea
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm, likely intended to drive traffic to these sites. The ML classifier strongly suggests maliciousness, and the presence of JavaScript points to T1059.007. Given the nature of the file, it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf415fc0d6d---39144642590.pdf In PDF document text
    • http://doubles301.jp/files/ckeditor/files/vexelegafoni.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/18650145670.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/91586242264.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/f686fedbcb61f7d4aeec8cb4873bb6b5/7653206823.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c2ba35d0---gomalugakajonuxemasa.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/zasubevuwa.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210704_37D06DD87EE263B5.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bulabem.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/bukowusotesewe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160be23096c275---23376045221.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/naxalozamawexubilajuxi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/navojawosezorobipofosuv.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/2f780b380f8d0887dfca8ab9fadc0470/8535359811.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bdhvor51vt5meh3k8v31eimg4s/losibat.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c71519354f---durufejatopir.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/majazopiwaretelot.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210504131022634014gszeap.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16098372938ed9---timejopugugewexen.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/11d02b23ca51bcffd80089bbd9594a88/jeluvukiwininedilivenalo.pdfIn PDF document text
    • http://exima.kr/userData/board/file/gititugibadup.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3998f24ca2---vimekow.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160904972d7871---pumipulexemozodigimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wow+classic+rogue+pickpocketPDF 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_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 18024 bytes
SHA-256: 2c58f3dd4c47143553af4125c62e5bf5438b60b781241c3cc750903a3acb8935
font_01_sfnt_off00015671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15671 10716 bytes
SHA-256: c0953eb9d93fb855600b941e99fbf1591a5bde4d2fc5cdcdaba19a3f214631d9
font_02_sfnt_off00016f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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