Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0b09a25d5379de…

MALICIOUS

PDF

70.6 KB Created: 2021-08-19 15:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 784c7982f0dd5e900cf3655d4cdff8d4 SHA-1: 8999f379897eab5482d4aca227bc38e55f8c05de SHA-256: 5b0b09a25d5379de3f5310ae98b9822df2d35678ccc7834d63f6b8e392b9725e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of external URIs and compromised CMS upload links indicates a pattern of leveraging vulnerable web infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6945

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://medvor.ru/uplcv?utm_term=times+table+worksheets+2+5+10 PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/aa5ef67a3f6c460fd9b15910b8f7bd93/18021906057.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/99239907328.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/05904cf6402ffbb824ce9e292b52d4c8/masejaxasade.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/61438330101.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/71951792083.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607432a2c8342---pewatoforaribomol.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/98514428287.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/0g92h88qhmadnjgbknc7o2eguo/44917382014.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/38799013368.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608de18089e6b---70411503994.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8569946437e03eb5c81071b6a9552b85/buwidafeligulove.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/vekuvitopoziwutilum.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/93ced959ea4f425738311032bea26a0b/59587936523.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b06e11288b4---tadinuzolorefibetugifuno.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a4de9434---sigemilogajik.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/52429383272.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3763d717d1---beligijofivaf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081137a89783---4279594544.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/28831653127.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9538395c7---15985486800.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/99607153446.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/zenizexujir.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/xupunanokuxugawuka.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xavon.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c7804f73cad---86176860511.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/52769514038.pdfIn PDF document text
    • 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_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DA 10980 bytes
SHA-256: b3bb571c3ac06e609cc98929e22970757c92fda5f690a47950ecedf08b92f74a