Malicious PDF — malware analysis report

Static analysis result for SHA-256 b353e987f2eee46b…

MALICIOUS

PDF

100.7 KB Created: 2021-08-05 19:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 212c2ab382850edb34c70ff1ff497031 SHA-1: 0626b17df2a9e2a266f81e67e4893aa464cfc80a SHA-256: b353e987f2eee46b3351443f265e62126fb1d4ae1305bae9fda874c60b63b36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics and embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=sample+resignation+letter+format+in+tamil PDF link annotation
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/24611976599.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21de5247d---gelikemajotesinuzopalak.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/duamgcsoc2o0vcv7dm4ucvsjhb/raguxelibifidiletadoj.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/35823773457.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/dalodukonoxip.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870e3c9f6da---towirowewulupumetizov.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20337d5f7b---jevibazuxid.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/judibobel.pdfIn PDF document text
    • http://cityfate.com/files/files/rorevukifekufuronepol.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/up0hds94n853rek575jdcqnka3/3281795828.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/vekelegofupavawob.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f06f51870---deren.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/51133456851.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/bavikejaxozenowa.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/teterigukizotigebu.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/45aa3a0241f1ea126ecffabbce7d8914/95252748374.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7aa748916---sukiregikarafajilarimi.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/fajelexinanozasaviwana.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/15269343061.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/gadobolafumofasit.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/gilusipa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce41e0b108---nujupizutak.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86643884a---vupedawabasovoku.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/gifitojasukovuxunanonoji.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_off000124e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E7 17648 bytes
SHA-256: e17264ae754d007fbf378e1ea71ed57a4acd7ce4268af5f928213ef828cb82a0
font_01_sfnt_off00015322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B39 10776 bytes
SHA-256: b730b2c5c26e7fa7fcba9e26703aba92ed919568dbe56308f6c60ff2fff6f434

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