Malicious PDF — malware analysis report

Static analysis result for SHA-256 df0ecab82bd958be…

MALICIOUS

PDF

90.5 KB Created: 2021-07-16 08:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ae6635e24d7122f2453ccc56fdcd399 SHA-1: ddbd4f53160c5c1e0c7e8937f67a762ec4a997c9 SHA-256: df0ecab82bd958bed47322ac8b81daa7732cb12dfedfba2aef47917dde698019
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 a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary function appears to be acting as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=yes+i+am+guilty+book+pdf
    • https://kartplast.com/resimler/files/dinijadububet.pdf
    • http://superplasticizer.cn/d/files/tagolej.pdf
    • http://bogelaipigeon.com/upload/file/tenopenalewurus.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/b8265ad2c7f69c6fa3d1baef19c8f58c/49105556226.pdf
    • http://umrllc.com/userfiles/files/jegunilinuzomoxapolerob.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/90a42994a108b8670bf1585919398dfd/vufunabovu.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nc9mj5r6ep1n6idobdujikkdg6/vironozukadogu.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9cc10c78000c5df8f01e7e36fe1122d3/93252493917.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ccd19a38---91710306275.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a251ab1cc---78433087182.pdf
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/58378222287.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8541835d105f492e4caa118be3266088/50724826217.pdf
    • http://pallenberg-busreisen.de/uploads/files/kubarorab.pdf
    • http://kraski-chernila.ru/resources/file/33625003090.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/99718733601.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96422bfaba---xidikarinimanosonisuti.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ba31822361b933a15d4e44e5746ea23c/disologekazawoso.pdf
    • http://tasteofruraleurope.eu/upload/File/tozuzalo.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f609.bin
4f39cf13cc66afc6042c98fad598a74735705973ca0488f3ca5bf5ed85dd5d5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF609 11064 bytes
font_01_sfnt_off00010f6f.bin
ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 1780 bytes
font_02_sfnt_off000117ce.bin
9ed90b62a78f82b269ba7d7365cfccada34794353c278b92a22902f7dca4d34d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 17240 bytes
font_03_sfnt_off000144eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144EB 16792 bytes

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