Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87c709f20ad6d12…

MALICIOUS

PDF

65.0 KB Created: 2021-10-13 22:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dae161837f5ff3fbc317f6fa4bc02fe9 SHA-1: 86f6c2769ca0593b8b83ba90c5d87606a69ef2e4 SHA-256: f87c709f20ad6d12fd57dc62fab6f0f661e407ca32ac0c885287c90dae15c35b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicative of a link farm designed to lure users to malicious sites. ClamAV detected this file as 'Pdf.Phishing.Trojan', further supporting a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, so the analysis relies on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tonofujos.pdf In PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/12268703889.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162ee4e3fe01---fudirozeto.pdfIn PDF document text
    • http://officegate.biz/admin/fck_upload/file/24160015068.pdfIn PDF document text
    • http://web5gstore.com/Files/files/16091419427.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/76011094205.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/52314117310.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/xigoginorirop.pdfIn PDF document text
    • https://umutfm.com/resimler/files/52706027781.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/lugivuzofovonajoz.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/dinikigalaj.pdfIn PDF document text
    • https://comfort8889.com/upload/files/66712609729.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616085efb822e---92500140684.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/51097461540.pdfIn PDF document text
    • http://horvathortho.hu/tmp/49834406098.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/rovajabavafupubili.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/18se91il1uc84f2lvrqk26bhd0/11126977677.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/tiwusifafof.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/pojufuladalakegozizu.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/pofovogiwaxek.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/kogux.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/gafodetoravuwedusapa.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/nogowe.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/sufuxifadepesirevegubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=rivers+in+india+mapPDF 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_off0000b735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 10400 bytes
SHA-256: b3b5c9d3b97114d49b346fb0748c46ce0e874abd41650331a2e53cbf3a03ba37

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