Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d2a69b79d0e93f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 07:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56beecd6e40fd650a48eaeb6e03af961 SHA-1: 36703a048cad09fb4c1290c546d62fc78c695f64 SHA-256: 40d2a69b79d0e93f53fd8cdd2aeb44e26c2c3a7d04003283aa0c5d2cef788cb5
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The heuristic firings indicate this is a link farm, likely used for SEO poisoning or to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests a malicious intent to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://inwebjor.ru/uplcv?utm_term=poker+for+android+offline PDF link annotation
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5c1c7e57c954b45b5d93d36158c80015/gatofeguwenumosurojuna.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210914065222.pdfIn PDF document text
    • http://prestopc.it/upload/file/14803903825.pdfIn PDF document text
    • http://sushi-belovo.ru/files/72915572296.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d5eaa25c03c993ff2b610fa122fe7664/tutasalelawusewedi.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kusupuvurewabusutixeb.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/zubusowipedevidunemap.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/o0h6o8hgh3oj1atijolac1anim/bepinola.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/mawaxes.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/legamakoxasekesob.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/fatodos.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/83308653476.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/zirosobovoxirudibedivu.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/pepita.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/45657437499.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_04_22_26_49_7663.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/nilebedokij.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/werufugopegir.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/japad.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/10577218608.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/58845813455.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89aecc6e---56093245492.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/datexobabimitosomebeda.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/vowutezaferibivul.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 10172 bytes
SHA-256: a8a649896d3ef0eaeb68ab51042f70a0fe52e378cb7b52e003307f344c3e19cf
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 17916 bytes
SHA-256: aa144e6cc71c27d76588e613c6c58aa533fbb7cd1b6fc6767610ea7e15b8d3ea

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