Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab17c1a853dd382a…

MALICIOUS

PDF

93.4 KB Created: 2021-08-18 11:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c4e7f4d28ae802a633e3d7ac9c589b4c SHA-1: 604a3365290d747bbe2ff9af0f5ca28f06b20be3 SHA-256: ab17c1a853dd382a968d36ebb5fc877fb43a89e78700a9f6e425b8a975fc63cc
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the PDF's structure and the nature of the URLs suggest it's designed to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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
  • 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://doubles301.jp/files/ckeditor/files/87958147042.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d3902b13c---54766838992.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/34178023271.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/femeraven.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/it1hrlcbhnn9mp386lavu0nhi1/42598132552.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8d122d6e4---58979139597.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/7022190526.pdfIn PDF document text
    • http://ihdbd.org/upload/files/tamalomemaxikamajugegavaz.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bfc58fa45c375c6da668e5ae07502841/ruvalovorel.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/lurumotewepewakuliwu.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/57364371567.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bebilakosusizefopom.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/31833750904.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/nudozamuxo.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xasakozasa.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/92089855127.pdfIn PDF document text
    • http://aplus.to/userfiles/file/9612644203.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/a74e74d7f8278d8bc4e4f6ad817a4c46/tajofinajiposalux.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/votabutedu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4b040e6ef---72111773292.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/7tlrfm7ibv8o1baf1sjkkq91vg/1527773294.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/towudisu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/xifuxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+hard+is+it+to+make+money+with+primericaPDF 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_off000107f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F8 11016 bytes
SHA-256: f6c3c000657845c2d0c8c4e9fed8a5786d3a9950c03b2f363c886a977587376a
font_01_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 17324 bytes
SHA-256: a85403afca99dca8fa9e85f3a71b3a5da917370bac9521778ca1502fc2621531
font_02_sfnt_off00014e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1