Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcaa4fa9417f9894…

MALICIOUS

PDF

92.5 KB Created: 2021-07-03 19:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be4ee28cae8f02e366ad21746206edec SHA-1: 1e505b4b25c6b688187e6e159f27e4a4774b97f1 SHA-256: bcaa4fa9417f989442d02fb0e59b01af19caea6d1b55e7a0217ddb49b300cc94
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple external URIs and link farms strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160956e5653698---26427646818.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2586c820725984a21888a4928df7b0ac/milojajo.pdf
    • https://alianzatours.com/imagenes/file/kewakajemuze.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9cb2a94c---81237023723.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608590c56983b---peneloxedizineti.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558b93338b---wapegijezemepu.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nkcbi7ev4o9n8oa3ve0qq2sv74/77038684286.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/mowurifineberolepa.pdf
    • http://daoltrading.com/userData/board/file/jumiwugigafal.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5629c73d04---94730381617.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd61a04f6---dazemunojudin.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/f3ad77d1d83da7b3f0926f717f978160/nolagexisikugemidox.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h5s7n770tlgd47lvv3jglg029d/12259365148.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofjk8lif2s97dsv1p8sfb26bj2/9939044624.pdf
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/73746007722.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65f0d2a69---39461984722.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16072a54b8c868---kakemep.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c601f619212---lidinovadatasogef.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072024eb984e---85309398922.pdf
    • http://tipiland.net/upload/file/82988554258.pdf
    • https://htchninc.com/d/files/97640686021.pdf
    • https://langestrand.se/anvandarbilder/204/files/wufinisexikulobili.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a73b9afbbf7712f93464d7667d9c82b9/32118164055.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210527082619.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ice+age+5+full+movie+online+free
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 16792 bytes
font_01_sfnt_off00011dee.bin
a9a021e6aa6105234b71f74a00aa30d0d85be2a3a7fa6c560e65a529d9cb1b31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEE 10664 bytes
font_02_sfnt_off00013661.bin
bf5659f1ba8b9fef2a0e65cc4543e290326b0d7fb238386c9e35722e3d5c3b79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13661 17724 bytes

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