Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1059f8440d858a2…

MALICIOUS

PDF

79.7 KB Created: 2021-07-02 06:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb002136571efa2a557f2f788dc612a2 SHA-1: 0efd8ed73e49c6743e996541d92d59d65ed2314e SHA-256: a1059f8440d858a28ab7690b1050101a99f7cd47f7a39c87a43afab9dd5adf36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=writing+a+business+plan+ppt PDF link annotation
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/23cnpr4h2d24c9gmmp4hhpaqn6/dusexipapidogakebalefe.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff97038049---gamukazosaroz.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/576b574fc7dbd863088e3f644dbf36d6/gulakepifos.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/407ec0b0d037d068ae6eaf52fdf09d86/70608543378.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/napubetisoxisewewos.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jl51qcmhplr453fedqom1im5ab/fikuguvinidar.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607311333514c---53033829737.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/93153558837.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/34761952472.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca1f1659c---jefaja.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/boxazajamagepofulizusif.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/zixewomepadafeguxewul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5808a32442---fafom.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5117102174---pabelixilajarebumivev.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba98c3a1f6b---bidijirefagijaf.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/42594990716.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/45217371879.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/deab82c06c28d557e835038b59b93ca3/vefifatowa.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a407c88ba8f---wotabopavovofepajimopago.pdfIn PDF document text
    • http://someteme.com/archivos/_20210628010820.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/76d38a32cd1a8f0c647225cbdf790c11/rovofibe.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/53944165653.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/lazixiso.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3593c28c52a9f322cc85cd7e22bf6752/95849541692.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc83c3353a---pitenebaroku.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a454b99c80---kamuxedaferej.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_off0000d59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59D 16384 bytes
SHA-256: f65a48e292f8d310aa8cbd79e46e349c64016e98d1732674a18c3b2e4243ce39
font_01_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E2 10540 bytes
SHA-256: ac1439dc145c2fb0c5f59c8b93fb92e87d32d6f39ec2c6c44119d62eb5e3870d