Malicious PDF — malware analysis report

Static analysis result for SHA-256 3575db55258ba086…

MALICIOUS

PDF

75.1 KB Created: 2021-07-02 19:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e490c03b0bd77992ac93a8e4980593b SHA-1: 1f6ab49ab53fa4ba5bcf3d7897ba755149f0113b SHA-256: 3575db55258ba086c98dd83802b1975f535eb902b1adfc0f3b6b50c6438acb56
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure as a link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://amoy-art.com/Upload/file/65779833208.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vt7q5142eloa67q8fmnh1tidh1/xasopu.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/23696690258.pdf
    • http://planbmedia.hu/files/vidoputibavebaxibukibejit.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec09dbc75---pujesumixopokulufi.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5qrl529trhtng61vmtfiee6mn/numimunibamar.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc2e021403---kajawejoja.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/0b5173ef0f628793fd07b59e7d8e27e9/55579748400.pdf
    • https://ikima.fr/uploads/file/89715191245.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3f4d0014---73020194549.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/24bac9316797fcd91b8bd0a0fb99143b/89042584720.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a561298a463---losopuzi.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1cikrt3em6seomtgd9c4hnqf1t/rafolifexubin.pdf
    • https://ksuskalology.com/images/file/23936071212.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe834997d8---19945084084.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/1r6n5d1hk333nfkhsrecrqp5j0/8874222256.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be557d0f8b4---tabozozesajekigivotere.pdf
    • http://besttailor.info/ckfinder/userfiles/files/wevinopofigubuvepug.pdf
    • http://accronline.com/userfiles/file/zexuxatira.pdf
    • http://shahnawazonline.com/uploads/files/36863605781.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/09cf7ad56a1b65f556abafec6469c854/pusimugoma.pdf
    • https://verandapattaya.com/userfiles/files/rinow.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077811c7e4c6---gewivarulaxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+cove+newquay
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c585.bin
1cd1197b8b519ec149c307fc829c1b28f9c1b1be89d8aff04fd76a10eed8a981
pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 10300 bytes
font_01_sfnt_off0000dcbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 16792 bytes
font_02_sfnt_off0000f4d0.bin
a35d94adbe9edd63c89b6b857db7205ec2e59ec5784702def79e83ffccca582b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 16456 bytes