Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ebef4a1eaca7d6…

MALICIOUS

PDF

78.4 KB Created: 2021-08-28 16:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 121dddb0cde97727723789b509ded21f SHA-1: 9726d90994a2ae230e36721376f9d3bed08c3267 SHA-256: 56ebef4a1eaca7d61893e793b29abdc54a1bf3311bd3d0cef5234d9ab0d7c805
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many pointing to compromised WordPress sites, suggesting it's used to lure users to malicious content. The presence of PDF_JS and PDF_URI heuristics confirms the use of JavaScript and external links for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=marketing+plan+for+sporting+goods+store PDF link annotation
    • http://albatrossmrn.com/konadnew/userfiles/file/wizazabimefuna.pdfIn PDF document text
    • http://bakefruit.com/uploads//files/202108091655278299.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/c1d822d2e2f856d63ddf4e880c9c1535/lomokixilaxusujir.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edd98cdfa56---gotobolikizogesipopufed.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098693acfd70---mozasunixirinini.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/mte9p1p1607msjq2lblg8hcoja/89374599005.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/71569736460.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/5a58026b25ab8864b926faa4a398f6aa/sibelevavubarenaj.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2c8ff976acb9224848d4fc6a9b30e746/28897236545.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/67186723639.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/90945088474.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa8da1a67---jexezarime.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/68864391669.pdfIn PDF document text
    • http://albertaracecar.ca/clients/49797/File/rorekizukimolaluwikodasup.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9a3c6a486---77432342865.pdfIn PDF document text
    • https://fuoriscena.eu/file/sijapa.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/zaxezixonoxorone.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/zosudekivif.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/65664365848.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gebokisodo.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160da907af381a---42585389617.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581859cb1b---jegubekim.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fo1l89js7e34ucn57tv96ket44/petokapavegatazefilifu.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/rupixaxojipowomeratitub.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/61609413372.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_off0000d22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22D 15856 bytes
SHA-256: 523fcd46af43ac272df6475762a1bc38b1c07330ec58fd64969b6ab5bb77d618
font_01_sfnt_off0000fa8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A5 10756 bytes
SHA-256: 504219d3b8ee9791c846b62be0f93e36e112439f2cde8e36bc309d1353acf0af

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