Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39b87838c127859…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 11:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 77ae7e9670a76c10f48ba44bae25cd14 SHA-1: c0b4c2a2f260b1b839cf9fd71c1d807a617ce561 SHA-256: c39b87838c127859dcbf257b6c4149a2266cb74cadb5a3013b245aa24992951e
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs and the nature of the link farm suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7099

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 https://promise-land.com/upload/file/44831153095.pdf In PDF document text
    • http://vizugy.hu/uploads/files/47976938255.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130054b34d9a---24940243749.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rizagelamosukovizusapego.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0b5f462e8---jadegi.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/gufiwevizodivel.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ribudurirukugib.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38956753341.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/31405083752.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pogopezuzironipomege.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/jukonosulepaxozub.pdfIn PDF document text
    • https://x-software.cz/data/file/95579705784.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/92328136987.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/70954370692.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/33651923088.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45977558639.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1ea0cb96---41458722528.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161329f7fc1dbe---44128162793.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/gujutuxexomozo.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/1105651156.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kaxadigedidedizokix.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/67079790211.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nojefateboxewajedabudeta.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/mogadojebosogajafowexa.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/xobak.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/kinob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=avatar+the+last+airbender+season+1+episode+1+watch+onlinePDF 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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 10936 bytes
SHA-256: 9a1527e37fcd943f09d578c81f326aba2b8111d9e9b7e31e9b8ad31a120d771a
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1