Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb1a7c11e5a95e6…

MALICIOUS

PDF

95.4 KB Created: 2021-06-17 11:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: efae3260f07486687caacea69613f419 SHA-1: 8d75bdc7a66e4b7ae4011b82cb958065a934797b SHA-256: 5eb1a7c11e5a95e695f67ea7d320d375ca9f0f024904ff0b4b27d2497b478749
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing campaign. The presence of the string "Site blocker for chrome android" in the document body, combined with the ML classifier and ClamAV detection, strongly indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://queure.ru/uplcv?utm_term=site+blocker+for+chrome+android PDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c268b554---xazadok.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160797223ebd6e---nobiviwibawiz.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/f62d2d11f2af8fcaa747825bb98ccca1/49483071142.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/pvtlrtevm85pf3eqm39hmbf1s5/82847139735.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8f7fd69c23c50ba0e84a5b6ff88bb865/wigufijuvadulefowe.pdfIn PDF document text
    • http://axwelindia.com/uploads/narajasirefofe.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/polofivovokefenugo.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a5b4ce1aa---81138891737.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/06da6fbbd0e4402608763404364bb9cd/gujinuwedozu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/ffe08e6f4a165bf1e189ea669e6aa51b/69889384830.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56d850bed---42266548731.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/nolusogosemotopiv.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1984726d96---jewaxopu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2785f444de25c644a80e604e4d97616f/kuwigoviwezikera.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/rikokezuvofufofus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/704a0ef3e68053363142757d53dc0769/kijilixezod.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://scripts.sil.org/OFLIn 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_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 5392 bytes
SHA-256: 7969051e07408370673603276de439715f28455ea38c6068fa2d468e641cadcd
font_01_sfnt_off0001318f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 10652 bytes
SHA-256: ef993d4fac6e872242b9324d7ab9476d04bf3e98a4561c86e986207ffa313671
font_02_sfnt_off00015637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15637 17444 bytes
SHA-256: a02b6155c8fa0830f0b8ec0246c272d8b20e4f6c2ec796a6b050b7c1cb623201

Open this report in the interactive analyzer, or submit your own file for analysis.