Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e74857a86a2128…

MALICIOUS

PDF

86.2 KB Created: 2021-08-16 10:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3b007bdcca136b6f0eeace6cf82a6fe5 SHA-1: fc5341431afd0b92d67f960f4606d9c4a59a2e47 SHA-256: 15e74857a86a212878a74b4f0975c9497d941ba7014bc891b5803c15c9132c50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/5791ed6f66fd0301d374b68317d8a894/97821867888.pdf In PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f88b79c08---23699674928.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/52549291064.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609486d1397e8---8570049101.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210619222522.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/elmvqu27k3fooo0c1gv7kooac6/60471339036.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/c2cac59bd17924d638c2ad0ed942fd46/kobekudenugid.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/jowabubup.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a141a455bc4---vegafuponaxomejitefok.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/m59trkifprsc84afsblc6qesup/54894027411.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/nofapojilokaraxavej.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/39511816030.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/edd098e6bb28afaec63c2ef6ec7b76c7/gujetadosaw.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9fb69f154---nedojukovilizu.pdfIn PDF document text
    • https://binhvi.com/upload/files/79841523007.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/27215966329.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19c03b46bb---48643274392.pdfIn PDF document text
    • http://aven.su/userfiles/file/73656148234.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/tofifisozixi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/5739657836.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/fobuwopi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a315d6bb9f---2873685394.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ffb1c33fa2ec8ed0a8cba02f7999fae3/zujalenugezunuzujasuv.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3608e6e97---vorusogipexizevotuwajobax.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/17407587220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+long+is+a+nba+court+in+metersPDF link annotation
    • 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_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 16816 bytes
SHA-256: d46105f75354129f8cff9f387fdec1bbdc1cb08cd8c24cd0c7b107ac95de97e1
font_01_sfnt_off000117de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 10892 bytes
SHA-256: 3cf30078c3ca37064158e5d4eec6853d1f39989f6b962c072dd78fcdf0facc13