Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0a8246024ecb56…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 06:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab16eb827d4136bfb21dbd36eb557688 SHA-1: 087c8a920316432d5b2157b88b483d904eea2892 SHA-256: ca0a8246024ecb56db44116af75b2bd7ce9a7408cbc5856d122601d125c24e3f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The PDF structure and the presence of multiple external URIs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=calorimetria+direta+e+indireta+pdf PDF link annotation
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/94301885731.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/36753452545.pdfIn PDF document text
    • http://recviem.ru/img/upload/41316017215.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/10cc6eb1a7a213f6f37c5f1a5b1606aa/rurizokije.pdfIn PDF document text
    • https://mavibusiness.it/file/jonolesaxorigeb.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/zogelawopogupigurufovite.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be56b18e70f---tiranavubelanotuvej.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/poxepirisugamegiroviz.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/lozaripelobovewazulela.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108251545299196.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe1f7864e3---koxudogipige.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/78536926566.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/soxusafixirejowekamidaz.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/3mi3642cncf471009f0hb4m65h/25360331105.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/q02iarpvq07ra55tb0ncb1m3p5/kesijoxoran.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/boxozi.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/ragedozusaluj.pdfIn PDF document text
    • https://davaocarrental.com/images/file/52565411548.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/mogenolitu.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202108282323135597.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/83593677138.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/puwetiliwulibejifurijifo.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/50067751524.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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 18988 bytes
SHA-256: c87fd40f42929dc7ae86fcd0316f1aa2e2a36af265f4adc50bbf9a7461bb5327
font_01_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 10520 bytes
SHA-256: 1b4255c42a094a7a9717e74d3b6ad89d6a0e85be9465c1f0da2b45c615d7974b
font_02_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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