Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6823b2c72c54ca…

MALICIOUS

PDF

109.9 KB Created: 2021-07-04 07:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a12cf1e99db8c9c34c5aa61760c10544 SHA-1: 4cc281fd5aea388fa154773818c4b69e67bf3382 SHA-256: 4c6823b2c72c54ca563068fcc960a3c55ebbaac88544fe6c756067654c9feff9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this, suggesting the PDF's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pixomot.ru/uplcv?utm_term=god+will+win+our+fight+chords PDF link annotation
    • http://pnmanagementsolutions.in/uploads/raxivife.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hm9jiqh1ml698p3psgqnksr29g/futawaja.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce4d666a8---29009521514.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/sabigefujuzenepopavosi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607731c25d851---72664256554.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afcb7aa034---mizenilojid.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/riful.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb9c8ad515---xewisudalutuzivida.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/725464436ebb1ebe9e99c3735283d6ad/91045653060.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/54559bc7836f95afb802e13b23c4e1dd/visewarigalefafuju.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072e4e6063a2---25759976896.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/towemowekoraxo.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9756m20e78jg4smbdt26et4ta1/17405748190.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mkcfvirlobsatgrmpjdshi6p01/72840630218.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6b43d5201a2f3ef7eb36cb9ccc3d2777/tedamotoxurevezugasevatap.pdfIn PDF document text
    • https://eventaipei.com/upload/files/59471083651.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b398c7ceaa6---zeboxapivaxipevuvo.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xupum.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/maremevemivozasapu.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/kaxadoximijepuz.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/43dd0ed0378d1ad45f41236c851b587c/sozovawugil.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/ralubezubafulotadotab.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/42b1b9e815cfeb80bbae03aaa47d997e/94776032846.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9a00jqj9n8dsidfg1ere74c6du/masaxug.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000149a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A7 17868 bytes
SHA-256: 63da64095a8ea7526393cbd7d6bda24006b8e34786e332f1e98b219e9e777939
font_01_sfnt_off00017864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17864 10684 bytes
SHA-256: 3a68b71d924f68033a71030a79c4d8ef2dd793c6e2c4599309ae033d2f55efc6
font_02_sfnt_off000190a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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