Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ac09995b14634e…

MALICIOUS

PDF

98.4 KB Created: 2021-06-27 07:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3db0dc3351510fd8735d8f7ac6469e69 SHA-1: d5ee3e85228babd06e0c4940f63ab6452cc4600c SHA-256: d7ac09995b14634e1449978e3ca9cc47fe6ffd67b60b40543f4583d74e14e406
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL targets suggest the PDF is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8fb763b68a530aae611b41a3885f42cd/91428560297.pdf
    • https://susta.vn/userfiles/file/tibalokawuwawun.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c70f1d2735---17072561676.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3elh0r6mj75gi14uh0pe7m2uf6/duvowejigexom.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/m2utb7u4uv33t3op2u8d5ljcjn/62599350766.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/fd0a8d8ba1b3cf9a601092dbd6f8fd08/gojix.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a94f7ee5f---80337373486.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ce5f1a61---jozavumuwonivogin.pdf
    • http://zlato-invest.cz/upload/files/36317436316.pdf
    • https://termoformat.md/img/files/5775706017.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ce5c17dd0---minobevibaduviwe.pdf
    • https://nasroglobal.com/userfiles/file/sewavamutolonilaxaf.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mnhbgqs196p3c6jhkmlhiin9oh/wadegebonipoxobibapim.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/jue32qp22g682rqs33lthtppem/tajef.pdf
    • https://harrisitalia.it/uploads/file/gitogezutejabokiman.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/ccc6061491b42e64410e2c2c2a81a754/fenumipuxanewaku.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c58a215267---bewitati.pdf
    • http://smepil.com/ckeditor/userfiles/files/70802585083.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d514e8a8d5---pirepefegevokoginepa.pdf
    • http://huiking.cn/uploads/file/231700049531.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ndcdjrrf3ff6birmc5l0dgds83/98950514833.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57eabd759---44639977341.pdf
    • http://fanti-fitness.pl/uploads/assets/file/74188423817.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/zifutedinuvunixazojare.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=stapes+meaning+in+tamil
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f04c.bin
1fe3d2dd08b0cc42b762e9d94dd2a5ceaddeadbb31b92dd5b17ae6725fe4bd6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 16920 bytes
font_01_sfnt_off00010904.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10904 16792 bytes
font_02_sfnt_off00012111.bin
b0d80b2b509fc9278d4134b264ca4e80ba80ff7361dbb74c16ee3c7f4870cbce
pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 3188 bytes
font_03_sfnt_off00012e3e.bin
9db07d2ab6b46938bbf6d54e151cf4a10c60348f8c0faddbb457e1fd42419f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 19840 bytes
font_04_sfnt_off0001621f.bin
99d3929c37b92890662716d0b90b0faa84cf3fa77724c8625bda573c2117118b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1621F 10448 bytes