Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bf663bd36d1151…

MALICIOUS

PDF

63.6 KB Created: 2021-09-03 06:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2c6f7932cd556f2e57a6654657fb5ec SHA-1: 66136edd0c37c1d226e6270b19b336a33c40fc03 SHA-256: 19bf663bd36d115100004abe3f3ecfec6cfa8e17d223162940f8af92325ce3e4
64 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 PDF files hosted on compromised WordPress sites. This suggests the document is part of a link farm designed to manipulate search engine results or redirect users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4699

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://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/73e78688cfaee291401ce86d09a9110f/guxulugo.pdf In PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/tsbs9hc16kugr0hk1vk4u4u5ro/35520064448.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021082500541547.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8e4c407d09ad97cbeb689a2b6f95f77a/3294676550.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/pafuxenelekanamut.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/mazamewolixidumenesiras.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/ee20b01be66d61af0b409e01300aac4c/27902955888.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bujunukazedatewobegu.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/tozopatedozuvojuxavanizoj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084e26c132f6---molukefenotomefokirobepud.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/2943afdd7d68f4d1e0ca30a10ea54a95/xopizotazusogexa.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/feauebh6an1n7d5hqseq6251p5/genotewuzojejovafevadam.pdfIn PDF document text
    • http://greenbrier101.com/userimages/50815572584.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/vofeduzas.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/29850699154.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/54922610758.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/5oumelfb9o8ijbpgsfp2j0rlcf/zubesabasimos.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/34851564127.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123bdde36c77---71812058992.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/1athfov46319ulg562ci4c9um2/jumogopun.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af6e61bc62e---tamiwumazozokapovama.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/mawibejirifukoni.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/lutipemonuzizexepap.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/kudagatudujunevopuzig.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098434394b10---juposazijemop.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/80903127617.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/84349165580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=chsl+syllabus+pdfPDF link annotation
    • 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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 10332 bytes
SHA-256: e0b7fe56b251031bdd1bebfef87cb87ac2f02eec7af00db5130034e9f5240131
font_01_sfnt_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 15168 bytes
SHA-256: d043c16f7dbd0c28e99e888ebb1fc117d29c3fa57ec322530bcb0443e94f7225