Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e477ea1a49411a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 04:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43a728bb96e022bcd44b3c2b7491d9f2 SHA-1: f26087b893ea17f46822b1d94f6c85d175f882a9 SHA-256: 11e477ea1a49411a77edabc32c74c57f6e0fe231d5959914d91964bd9c4241d8
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to distribute malicious content or conduct phishing. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external links on potentially compromised infrastructure suggests a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9621bb0fb8---42292821308.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/t6dk6gas5907deqva7g46qiv5r/41638589749.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/tenejerufonemaxilaxafi.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/61710458309.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/30003099635.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolojetupivezarigivaj.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d584b06e98e---2967672287.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/wudekaregubufonujasezefat.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4fb62c527e48a9cdc9e4e61cce6a7e91/8356180816.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/goditebibaba.pdfIn PDF document text
    • http://atya.eu/files/file/7146129687.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/bofukex.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105231732.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/muxejetagazulagoxufelaxu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/85393220934.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/zupuje.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608723a893be7---9089779078.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a4691c705---38608375852.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/vofasoz.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6d4616723---32142367928.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/97331596791.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c0a0ae3aec0eae2f8ffef92f953a7cf1/vilonilibevifagafef.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t56ctsvtkva5p13kvlfcsk3fo9/rigajulimukopeseli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=manually+connect+apple+watch+to+iphonePDF 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_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 17244 bytes
SHA-256: 75ddf22faf40bac9ea8e1bbe551051c4b233e1990b33f54b1ec4def5fc3f5e14
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 10496 bytes
SHA-256: e7acd2cb472310849a7badf2ec06ea8202d9a16fd1db46269fdd86df7fcfe4f0