Malicious PDF — malware analysis report

Static analysis result for SHA-256 6046800bef4a3421…

MALICIOUS

PDF

79.1 KB Created: 2021-06-30 07:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b00f90ff4d63db404087263e400c656f SHA-1: 3bb74a689f54120b9ffdc42517c817e01fb811eb SHA-256: 6046800bef4a3421111b428e2a701cb10d3d0640703d3bff9dacb176f8e0f128
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to potentially malicious content. The ML classifier strongly indicates maliciousness, and the presence of link farms on disposable hosting further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=meaning+of+at+wits+end PDF link annotation
    • http://tktravel.shop/FileData/ckfinder/files/20210630_0E9DCE5D39E8B4B9.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a289c9ce---totaximuz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160805e586d2d1---jibevuwodimosewolegevur.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/4b5084b6a52988d430a94efa3f030380/neluwezox.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/21357811313.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc025ac503e---zomakesavisemeraro.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/sibixufaro.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qhlbl6748i5cnqo48ci03nipan/rerorejode.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24c4b94eb---42011478717.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/62527053317.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607033c96ad75---18582277617.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/88701763153.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lujivowunemuxubur.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/70807979279.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab261210b49---8791077303.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099713b75963---tunuxifuzuk.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/zasaxodizizelagi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf88d5c64---79162849927.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8f5dd22c---vodigisuxuvejoraxubefe.pdfIn PDF document text
    • https://zhansq.cn/upload/file/namupuzib.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/76121494988.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/55614776251.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9rir0pjqej7ad2lhl6b55mn6l1/bexosasiwixolubuxulak.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d5dc7a6c32c966e1ece382e54c649714/97196955215.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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 17540 bytes
SHA-256: 4e707e31119ca06b64d250bfb16e8be6ed10c1253dbf33c2304d4c4503f48fcb
font_01_sfnt_off0000fdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC1 10464 bytes
SHA-256: a74e42e67975104ca76e60bec3771e48b21a69392e0e0ceaa12fb76c7f16d862
font_02_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1