Malicious PDF — malware analysis report

Static analysis result for SHA-256 7021a16c88201c8e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 02:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7773639b5376b59b2165d68a586d7232 SHA-1: 3a7d5c8569dd34fd0a48293c712f46e6345411e4 SHA-256: 7021a16c88201c8e180e6f6a4491a7dcc4fa7736cdccd9dea317b4e44b88f579
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detected this file as a phishing trojan, reinforcing the malicious intent. The presence of multiple external URIs and link farms indicates a likely attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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://justsayhi365.com/uploads/file/89644233700.pdf In PDF document text
    • http://myphamso1.net/uploads/files/18449273086.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/33295936437.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/gasomam.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/38194553816.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/q1i718ui062lkt9djhl2i5us2s/nokokidudodetuvixa.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/6e8fcd53a3aad0eb55e935f0f284f039/bigubuzogabibiga.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/26806109807.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/92142453985.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/31658252795.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/52183776190.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/gujujekex.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pufuputemaxebana.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gidesilefijepok.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/74513573794.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c98f26c3bebaa043caa523afe9961e13/mufatekigimulawewa.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///vewazezobabulajutog.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6e16559ef---gavovezawuligisikusosuk.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fatobojavixozi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161447ac483265---pezilogilitawipobo.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/66686631295.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/ladakutevipoziwonuxir.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/wivufovufijan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+hotspots+sydneyPDF 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_off0000c100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC100 10464 bytes
SHA-256: e79a778c0d8a29ef2a73e06e9d6e1ae1ec79d8db3e02f3c19efcbfc0a33c2044
font_01_sfnt_off0000d8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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