Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2a15b02510237c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-07 19:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bf153644890a6b6fd1208718c6036fb0 SHA-1: 4113e703a978891b173053701455d6bf7f8672b4 SHA-256: 6e2a15b02510237c1cef68173d29c9bcecb0ea8f1f803af9b5763e670c363a6c
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or further compromise. The ML classifier also flagged this PDF as malicious. The presence of multiple links on disposable hosting and the use of UTM parameters indicate a link farm strategy for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6585

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.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a0842b312---liwupumoxig.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/54466487496.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/dosajebavata.pdfIn PDF document text
    • http://acelybio.com/upload/files/29109716570.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/031809121302.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/5919279395.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/puravebadi.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/muninililak.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/lifinalabuwopesarekebib.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac979faee---nubebunonugo.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609dff8abd092---52919642765.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/64c06f6dc2988bc8cbc094f30ed0589b/nugoxazolovilelijejeturem.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d42eb1ab38e.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/figababofesiwudo.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/39592682784.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140719367a---70065601226.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/87967629320.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/zunabu.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/wukafuxo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc926b4e721---61409719862.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/1jo2i3f4hn5vcncd51ud114m80/42132984225.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/92755520531.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/sidifutewifukaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=adjective+clause+exercises+pdfPDF link annotation
    • 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_off0000c127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC127 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 17512 bytes
SHA-256: ae50d784de6bd49a31d1e73e972cf3be7e36ec0259dc7f94746f0e146405fdca
font_02_sfnt_off0001067a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067A 10768 bytes
SHA-256: c55b2a1f0c55030aad2a658e7903f4403209754b687737aa831851d9cfe08f18

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