Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e8cf50efb8427e…

MALICIOUS

PDF

90.8 KB Created: 2021-07-29 17:23:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e248fdbd8e639f6dbcf8cc146de22ed3 SHA-1: 8c90a9396b086126143d9c649e36cd533ab36484 SHA-256: 75e8cf50efb8427e7cb392bac764ebbb73dd4d3d88d0db8925cfedaf08667490
196 Risk Score

Malware Insights

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

This PDF document employs a social engineering tactic, presenting a lure to install a browser extension or update to view its content. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the presence of external links and the 'Browser extension / update installation lure' heuristic indicate a high likelihood of malicious intent, potentially leading to credential theft or further payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=where+to+download+free+movies+and+series PDF link annotation
    • https://zegabilisim.com/calisma2/files/uploads/mudezopa.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c7630475---kepunoziromuruwifobenefu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14b8870fa4---11387446711.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/68861577488.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/xudigefezuluf.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/rirodoto.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/kfel8abreiddbsqo5dtom9ltv3/11829745441.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f9ed3d5450dcbfd82aafc1ad1f423e1a/lojokaselowo.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/fukodalidesalivomaxurub.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ed1569352---xosumuzuminovejoduja.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160772c5e8c4c8---88121593688.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/73349055726.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084861484b9a---47498222371.pdfIn PDF document text
    • http://grimastone.ru/files/magojakuf.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/24908258817.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/dbdkievgpkhrtmpi2a3o8qh8hn/55884557097.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kajos.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca85cfcdf66---zeluwaleverutopotifo.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/40910518703.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/443abc86c4ebd7000b2c551741604ecf/lemupofitajozu.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/sovevopilosopaz.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/bimaxuxobojewepeborodifi.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_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10764 bytes
SHA-256: 49da4799c69ece7315f9d455c7733476daf9ab6b6ebd620be4275ed9b64a6ae3
font_01_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 16964 bytes
SHA-256: d405a9d0935721b05131aa1f8552e878223c21e99ed9c43ea461d46123614f11
font_02_sfnt_off00014531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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