Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c0d0f3070561a77…

MALICIOUS

PDF

87.6 KB Created: 2021-10-05 10:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5dc6a23552e457e11b4ce90de02d704b SHA-1: 88be0bdaca0f9d21305ce63560010d6cc828abfd SHA-256: 0c0d0f3070561a778d1d74ec376df4c35dd69624c4faab5f1f3ebbe8ec1e3479
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, directing users to potentially compromised or disposable hosting sites. The embedded URLs, such as 'https://huntic.ru/uplcv?utm_term=how+to+tame+a+pachyrhinosaurus+in+ark', are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://huntic.ru/uplcv?utm_term=how+to+tame+a+pachyrhinosaurus+in+ark PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9698291e4---xifilajunulazo.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/39161474093.pdfIn PDF document text
    • http://birdwatching.sk/media/file/koparuvotolupufu.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/54380a922c37011e60fda4fb1bade835/zixepopagivezikodosalofi.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156fa0908414---josasaropeviduvewimaw.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/ritaxovojodofuxujaritefe.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631208097.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/bigupelejirowag.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/81742481711.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/75627767763.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/30f542f45725fb81cc7981e314e8c1ec/64658874901.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/1633374388837.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161316a26c0e50---fobawutedamit.pdfIn PDF document text
    • http://agro-partner.com/Image/files/siwajes.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/fazumibepixop.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/35cb6e5bccd37525c56244ffe70f84ad/17874118724.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8148966fe92d46d326fc233487c71cb9/64055430637.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/71110511151.pdfIn PDF document text
    • http://koutingchina.com/upload/files/25032268915.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/durokigibonutir.pdfIn PDF document text
    • https://clinicscrm.com/img/files/1448142555.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/puzijubusobividalu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/7570160368.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 10976 bytes
SHA-256: 5af88f90ae712022156195729039ec19ed5b88f78c0d1af500dda3c18fd3f354
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 20196 bytes
SHA-256: 22df391468bb18fb62d5c9d5692353e1cf5852f8dc49d70c55be61afd9119fc2