Malicious PDF — malware analysis report

Static analysis result for SHA-256 033bf244c8cf8cd2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 18:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f432dca2b6d5fb1c37c0091ca1a8b5ea SHA-1: df61ece72a2869a278ff9096b7da0aabc31c1873 SHA-256: 033bf244c8cf8cd2633ab79e013bc4da0a7be583504d8bc55410142b8bfbe9c5
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://exporoaster.com/app/webroot/files/images/pages/files/7637224582.pdf In PDF document text
    • http://www.39koratmachinery.com/file_upload/files/26384915024.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/nikekuwipugisonadupuk.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac21747ef0---89222192861.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/56379181151.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/tobumofezusategovotunan.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/luzud.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bc7f3bff1---15536961932.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/3o1609kr17ipt13suq6q889780/41879796106.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885af28f71---kegemaziwabenupuratu.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc53e86aa9---31543380519.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/89261742283.pdfIn PDF document text
    • http://18554080.com/userfiles/file/zobuw.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/g90vcp6e72tbg8bt8j9i46tk45/xawovatazixenakas.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/887b60a2001bc02a9e9d32998b553647/lenalojovedifopabid.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf8fe65a9f---98957862670.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3f4ca602---98938392372.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/vesikonepel.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bepavotore.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/dubujoxotoxewuseli.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210814053841.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076b81e3efa1---30873994206.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210816_9A4CE937E9CB0AEE.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adaa4e64ef---72790458460.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/32a7a5d6c0575f3c8c9051499710e045/vawamijirigopagiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=salud+mental+pdf+definicionPDF 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_off0000e46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46F 17552 bytes
SHA-256: ae8b68ec7d3a1d2ad93bbe6ef95553baa561bc53189bda36f3734e389578e9ee
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A0 10688 bytes
SHA-256: 2ad61ca8c8d1c7c73f03d853af3f50c08b04604d63c5f23e2ba2fc31b60079e2