Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8f9fa4028f4368…

MALICIOUS

PDF

70.4 KB Created: 2021-09-15 09:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab907671b1462b176dd2d04cc05686b3 SHA-1: bfd23e8b73fde31f29054eaf9187e85b3c90219b SHA-256: 3f8f9fa4028f436889fa365b7950c5a8cd46f5bba5db22fcfa633b0d4f8ef715
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://zoorichi.com/temp/fckeditor/file/90074062558.pdf In PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/lasoretuzonuzomodem.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/buwipiwiduxikomuzokebiboz.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/gaxamodadegax.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/tajasazibine.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df05f15e---97926554682.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/80508837539.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ecab934fd5---47328877643.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/67072588281.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/puminepidunemovuputu.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/6266752942.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d475de9ef5---wojexiz.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/83834408096.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/tekalewajupugurovul.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/11947400599.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/67781051320.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614156fc85671---sujoruxuxewesapaf.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/61814897591.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/joribudubopigus.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/22793643563.pdfIn PDF document text
    • http://pileki.com/imgup/file/85223358289.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/vatokibukebowo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27d8fd7121e6dfcd157fbba88e69e88e/gisagesugawobejopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=doctoral+thesis+pdfPDF link annotation
    • 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_off0000b315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 10616 bytes
SHA-256: e7fa9acd88ef3591c3ceaa770cbdad11216dde7358b18c960c23d2722ecaea3b
font_01_sfnt_off0000cb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6E 16116 bytes
SHA-256: a8947f9bbfef4e18752d20ce67556417b555fd2b9d00db6dce1cd346e2745ab9
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.