Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7455f511e2fa6a…

MALICIOUS

PDF

121.2 KB Created: 2021-06-25 12:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e217bd7845bbe6efb99b84fb0bd8d16e SHA-1: 61b224c80bb03463c3a97d3c3c58c9a399145921 SHA-256: 1c7455f511e2fa6a5b4546b7e04c1753452c7cd04c7e9ace4782a54533b2dcb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the embedded URLs suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=mt+24ex+manual
    • http://csptech.net/admin/userfiles/file/vumifefolewigurupevutike.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b6e964de749be04f5363a97ee101c477/15241180343.pdf
    • http://stlukesmn.org/clients/17773/File/rutigeji.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b272b58bb62---nodupodi.pdf
    • http://wittlich-luexem.de/userfiles/file/76336829943.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/gavozuguzazodulu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol6hi3fqk4mofr3f2dgs3010a7/42773029304.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710299a53d2---77552306444.pdf
    • http://poorclarescork.ie/images/77524849269.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/51925253125.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb23f342b---bezotilakazefunojexofi.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kutodirotekonagu.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/ac41147f2d87ced9ebdc8d40c10977bf/zidibofe.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fa829e21c---42872614256.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cf03d1bd1dd134b7199e835f1ed43fa0/58549719468.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a50de0996e6be0f32953c42fe7064b6a/vukexuratefufase.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_off00014078.bin
577d7fd7ac0252e513cd902faf9785678e9aee679dcbab67b355c8ffe4b90dd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14078 18528 bytes
font_01_sfnt_off000171e9.bin
219ad3ef25876be9beb28177c2d680c4ef95d7bdaa92ac58246aafffb8749476		 pdf-font-stream PDF embedded font (sfnt) at offset 0x171E9 16808 bytes
font_02_sfnt_off0001a5fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5FE 16792 bytes
font_03_sfnt_off0001be15.bin
93b474c9c946dc54cc369698a5607233b005f5f479026b3669ea71e903c2aabb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE15 10180 bytes

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