Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b676c0568169352…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 16:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 748d520f86578a485dcc2ce93c33551b SHA-1: ec33cee6f3cc25191ccf86e88725359691f68481 SHA-256: 2b676c056816935229fdb9fefb19ac66eac9405664f85fba1529dd8e4e5a8dae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farm heuristics confirms the document's purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://archism.ru/uplcv?utm_term=live+wallpaper+for+pc+one+piece PDF link annotation
    • http://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/59788024922.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/28050276030.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/77523147474.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/kumemevijaleto.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/7ee9074dc6fa4853a3457f4eedfa5f2c/mipomisutevujadobamakuved.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/56107951675.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/12602174140.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/putavajedesatodonil.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/11f36e05644c8b4036a25ae902c96d06/73144423236.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b497c431cb---73435462998.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/feguxewoxazis.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sijizigitebuxokuzemi.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/kixofitixejefowowiruweva.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/gudiwimojazi.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/22250810050.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/xomejosuniluwinudixujafo.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/xukemugefufasevasan.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/setukina.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/168205226.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/934639aaf6a58c468d2d4af9f3ecc583/lixigeziga.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/wisoles.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sofeledopapobivoruguk.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359787aebf0---8334770199.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_off0000bcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCD5 10316 bytes
SHA-256: f0df4d1a0e2e4b3b3cb6903bc88f1718d83db51c346d8b987eb2887c3fe9041c
font_01_sfnt_off0000d439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD439 15928 bytes
SHA-256: e25a1fbfbc5b15ac60718132637d1851d829431256f8fe7f7c65e4cca05b5a8d
font_02_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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