Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c46aa912652835e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 20:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f9b81501a036a6913add13be2551d54f SHA-1: bf5236bde75652dd85bb3ef860ffd87d81da0ba3 SHA-256: 7c46aa912652835ea87c3c0bfa7c9abf95eb0fb5fcc9c61cba48332ff36a234d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious destinations, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=multiplication+of+fractions+worksheets+for+grade+5 PDF link annotation
    • http://decom.pro/admin/ckfinder/userfiles/files/bukojikefipejunaxoziw.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/etto5s683n171ff9k4seru8p2h/20352069064.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/3278aacf01e5d7811bce25b3252467cf/96236440856.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/sojiwufavu.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc5ec4a1e---25908362687.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/80948659426.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/82014354534.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///37350502853.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/wedogin.pdfIn PDF document text
    • https://aspirans.com/files/file/xazexis.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/529d1a8963ee985e30e2a4504a9d9d7e/juketaxa.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608526e0c22e3---79516287853.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/88505969397.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/63170018275.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/darowikuk.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ce6ce3b6b---29497820354.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8c91sfa233eilvju0essru45kv/dimifilemibena.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/1040735619.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082d2123bd0a---31848078200.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cdca116d46---59797493093.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e4b0f01a6ea4bf8feadfca49f39a97e4/88467548603.pdfIn PDF document text
    • http://domoticasociale.it/immaginiNewsletter/file/74457610287.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_off0000d1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AA 11304 bytes
SHA-256: 7321692be731f66b70ab9925ce3bcf7fe53ca55a60195f77e4fb0aa74476f73d
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 16556 bytes
SHA-256: 78dabe155c68843715153846c0088b24c18dd0a42075483338efcc81b5a51161
font_02_sfnt_off000116a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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