Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3569e6d4d5e0401…

MALICIOUS

PDF

87.5 KB Created: 2021-07-16 16:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ee5d772654ac25e6af3be52aabbaaf1 SHA-1: b5c9b0d5502d35a6d3ce0873be6e1483a77fa2e2 SHA-256: b3569e6d4d5e0401c19410fb0f0bb5ebd994122633e5a0148360762c1a657cf8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL findings are sufficient to classify this as a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=gentle+reminder+email+to+client+sample
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607160f475da4---niwozadozelusoxizozufa.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b65869eb8---nuzegizedefufobupolubanop.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37984270405.pdf
    • http://pamat.ro/UserFiles/file/6651089632.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e22427ec2984b2d139a6d0845cbb9906/26989316560.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873dc75aeea---21266200956.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c8b4c9f3168050789a6a8b9faf0ac75e/88157504922.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b29cc3f284f---nudil.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/7281967823.pdf
    • https://adtw1.com/ckfinder/userfiles/files/98288571835.pdf
    • https://vili-al.com/uploads/wysiwyg/files/52692309494.pdf
    • https://condicionamentofisico.com/arquivos/file/juwokifixitevozu.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b302987e4---34589408264.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/612f7e3622bb99f7ee76c7aa74adb91b/jiluwix.pdf
    • http://cdmatik.com/uploads/file/50305918822.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e216d6827f---23793349398.pdf
    • http://erbaytag.com/resimler/files/46695567868.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e891244455072d971cfa12666eed844e/talomadibalefinedi.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d2b5c105---kuzotufi.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/pilokibej.pdf
    • http://internationalnetworksolutions.net/files/vanenexatuzejodipuselukas.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b81423c5---30480201855.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/83ff7b9143edc72fcd321e1943da9a46/wogumejekudikukigu.pdf
    • http://sporteambiente.it/ckfinder/userfiles/files/kawukajisidape.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/60781327385.pdf
    • 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_off0000f28e.bin
b321f73bb44eedda99ce39e21872dea80e1647a3649ed4c354928ac633541f53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 10716 bytes
font_01_sfnt_off00010b22.bin
4085ba71e07be25b5fbad0a5ec29ff4f629f152643a30e5bb9e2f580dc22e780
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 17260 bytes
font_02_sfnt_off0001385b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 16792 bytes