Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a02daf0787505d…

MALICIOUS

PDF

60.2 KB Created: 2021-10-06 00:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6a4d87a19e30efbcb2565d766aa04908 SHA-1: ff646900d655e422dbaaab928327e2f4d12b580b SHA-256: 85a02daf0787505df938220fed303ecbed0e12f0e6408dbc49275cc2cc9233c6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated maliciousness. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the malicious intent of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8243

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://inwebjor.ru/uplcv?utm_term=how+to+clean+frp PDF link annotation
    • http://mtecommerce.it/public/news/file/pafudifopubuji.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906151823.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109050301151286.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/novuza.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/56284472042.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/xekodamenixexobek.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/lujirazexulorufivi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/fatud.pdfIn PDF document text
    • http://ihdbd.org/upload/files/11179852100.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/22032065161.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8c79e7dafa3a9f26b1189ec17e70c753/ludukuz.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16147e5c945ece---sufoxogarudubexuwoxejar.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/rosuvemawolikenavat.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021921758305902.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/67999352862.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/35357428860.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/67360091673.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613316a5a45e0---jezatewuxi.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/puwozoli.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/lisedaxiwi.pdfIn PDF document text
    • https://majubesar.info/contents/files/guxigug.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/hs0i8jl1ta3msj425kdh4amo8e/91419261302.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/53369035661.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///99428095672.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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