Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6187e0c79a104c…

MALICIOUS

PDF

79.2 KB Created: 2021-08-11 21:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fc1e84e88e6279cf33a76bee4a6281b3 SHA-1: 4fd4f29c7b90fb513580d41156838cf6e42f7d03 SHA-256: 9a6187e0c79a104c8746911d598e015fddbd8dc1b2d7c8ba831ae3b043ef633f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8589

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf55099194---58843913752.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/95710046603.pdfIn PDF document text
    • http://emannsltd.com/userfiles/losikatigalikup.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/55811449908.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ba5b7caa36c1def010df17d14a044db5/70975522322.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/wobizidafebo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/946a73bbe12ca1085f98e875551f7d3a/zadorexirilozoxajiganemog.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/kizerenawogof.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/zelewesuge.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c521ec5beaa---30108272565.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/bdc4c55558bca220fbfc63362d7b0c75/95666670759.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8df73bcf3---besebajuvexuselodilu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/puzizuzejukapifiz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffadbe7d76---83968764714.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/buwowimuxogav.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/64139372565.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/3ebe720a6e74aca02a53d1ca06253696/kuramigesesagesatarom.pdfIn PDF document text
    • https://dcimx.com/files/bukavuvunefexipipuzefa.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef65257509---bepiviselameduxipunoto.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a6b4f2a5---gojukupufixekakipumejuzop.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/3723163305.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff055f2109---83658341515.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/pejobanebusufufovowav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=best+free+terminal+emulator+apps+for+androidPDF 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_off0000f7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D2 16924 bytes
SHA-256: 8bc956ecd6def6cec855e54cc4e791874f114440311e9bb580a3b5b4a2bc304e
font_01_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 10812 bytes
SHA-256: b2f43412cc899e3a0171e0c6626b656842707d3f7c10d9848eb415638f4092aa

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