Malicious PDF — malware analysis report

Static analysis result for SHA-256 170510be5057e159…

MALICIOUS

PDF

48.0 KB Created: 2021-09-25 04:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 052a221f3ec5767338ca96294732644e SHA-1: 261fa03652c0c6e3f75dad0dbfd6c90c17ebd091 SHA-256: 170510be5057e15970950eb03871b3da7d980eb799624f6f42f097647be16a5b
94 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting. The ML classifier also flagged the PDF as malicious. While no scripts were extracted, the structure suggests a link farm designed to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

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://nwatchonline.com/userfiles/file/zavozefunipud.pdf In PDF document text
    • http://faw-asia.com/image/upload/files/domafopadowaser.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/lerigafamifafonakeko.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/dapevixis.pdfIn PDF document text
    • https://labelmarket.pl/data/file/10323675057.pdfIn PDF document text
    • http://med-os.com/user_upload/file/zulirumusidod.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/7c87f501de21d4026235b333c47bdbb6/fusobena.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/45446477473.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/dadolepunozaduvurof.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417a345d08d---39374516685.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/bedidutotutiwiris.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/47811945420.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/fopitatuve.pdfIn PDF document text
    • http://elpijisystem.com/file/78421008257.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/pixexuziviwofesanam.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/bagugiveg.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/84246866111.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/53959962342.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/56850326613.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/wuwadunodo.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210913204414_904052685.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/febux.pdfIn PDF document text
    • https://hideab.se/tc/Mediagalleri/file/podotupesi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c0026906---57467036630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=onenote+app+download+for+pcPDF link annotation

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