Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e795bc836b99923…

MALICIOUS

PDF

93.2 KB Created: 2021-06-29 09:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ef1574dadb6ff626f5ae1af7ef0a8c4 SHA-1: 8c95141be43feddbce95b4fcd6fb76010299bff8 SHA-256: 4e795bc836b99923ae334a89c0c3451811cd244c65836a3d5ec2e9118f04c818
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous unknown URLs hosted on potentially compromised websites. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072577881cfa---16090255986.pdf In PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/na34om6hk9inivk100iok1bnk6/jitetojomizakafo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/48945709934.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/2dca2bbcc8cae84ffca408a3c73efb1f/71146967283.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e8ba321cc---3020805712.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/66107202469.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/jijopobawibu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32325ca55---wefumazumisetojaroramego.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083594d5e805---tusubawasonekiwekageb.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b841f75e6d7---vadavow.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/50431897134.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/ec5ff322ccd850e8b296b58a55d7c678/pitevot.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/rugofozufejezedaziw.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/167cd9979bb237549058639455a35bfc/48942122012.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ro8mmo1l1hobctfg9ali6i631k/lozidu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/tukomozovitinivizuvo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096041a92f6c---84085916997.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759dbbbae4---minifaz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92d521f78c---lojexal.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/bid9kgug41ikb4hqh3bqijb6a6/66603479504.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e2eb4c340---luzamafukopisekemuwubelem.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/987aec87c752b7fb79fa69cb6ce9fe5d/9582545903.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/rivoxubibuman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=guide+persona+4+goldenPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 4268 bytes
SHA-256: cb2a15266e0dcd9efe73b0e8b410d502dce42887e1caf23823523052d650296e
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E14 10688 bytes
SHA-256: b587f4538dd4d3921c5ce9da7884f0cd53ec00d5420773cbfb8eada759d0c80b
font_03_sfnt_off0001367c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1367C 18432 bytes
SHA-256: 07f2592e217191e4fc68f68ea10ca5154aee7b69625071512a9264a6c329719a

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