Malicious PDF — malware analysis report

Static analysis result for SHA-256 c612cef3d6f2f53c…

MALICIOUS

PDF

93.0 KB Created: 2021-07-01 00:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0234429bdacf35fb0fe1d0a467d16023 SHA-1: ce4df1db1275eae8571b1ac36c4bf6a57545eced SHA-256: c612cef3d6f2f53c9230e9fff9775bf7a34176e789a6789cef3456252b25e68d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'utm_term' parameter in one URL further indicates a phishing or tracking intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=wings+of+fire+full+book+pdf PDF link annotation
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/50de20f6d3ecc899acf46d7c398d1988/34340378051.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bbde63a639b---95730361993.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bb97e8cc11b---tejuzogurapodopodebex.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/9cad732907376aa699bac39225e76af5/5237020870.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a46568c9e88---30553424896.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c594a38c8---gasimaxatizokodavi.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/70775081283.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/32237523600.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/95110050325.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22845262da---tejubujobo.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/22346396901.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d5ab5bca8ca508d4d496664609edd9b3/bemuruladobavulujujitanid.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/e0df7da025ca636bf4e1be0853cc5813/2452320641.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/72356920721.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f04bd06dc6---vetavur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af07257d64f---wuluwuvedixogozafividaw.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0s40u38gsk9rhl0vv28a1ouhqu/xaliduvadejeluko.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/kijufuxowuburebax.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609e683fd3f91---bibekodurugivutu.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/0gvfnfpjluh9amvh67562npl23/govuvidijinudofunipegedej.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/sexasiwo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b7d5995712fdf92b992979516736d1df/mefurovuwa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607130f5124d9---sipefuxabebewadug.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/68416470771.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_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12139 16912 bytes
SHA-256: 6d775e9b6404ecf8bae3b9230b99cb11ac6e907d14ff37119c43efe773de49e2
font_02_sfnt_off00014cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 10736 bytes
SHA-256: fe33e294752c827fbba0c119c79851b5b17ad2b2eaf12c6b1de541be9051654e

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