Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb8f23628ed98c0…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 19:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 209c24bc9ec8990fbadbe8a2d15b6069 SHA-1: 6b15db4a3f22378a11093b20591bab6651738e50 SHA-256: 8bb8f23628ed98c00c056b5c6082713b8921592009618285ce124f92009111b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of multiple distinct hosts and UTM parameters suggests an effort to obscure the true destination and potentially track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://philabc.ru/uplcv?utm_term=national+new+york+central+railroad+museum PDF link annotation
    • http://quaretti.it/userfiles/files/pifomiwa.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/88555941934.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/cd85f5b65f7db6128b6569a4b3bf916d/vukurolotefasoreta.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/16427792372.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/okjs3jb4f195upbadjqr5ldok3/25495339849.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/30058017527.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3049bb6947c559930fbddf638ec0c1fc/tiladejixedosololuposutip.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/labejetekuzaletosejezo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609360bedff28---157530688.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/sowafabudu.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/31291810090.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c0ff1f36f---zotobagiwevetigigikuj.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764092a0b52---94327904609.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071090d70f1f---nodemobadakerinem.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/tavilovigurosutibola.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/wirovij.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/d40114b8c55893deddcd637ab87578a4/50447094324.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/4d0c01f8ea54c0b152d91b854bb5a87e/nofikado.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/19054646050.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/kagazupelotis.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/semopemonasewaxawad.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wefuded.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/86139626616.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877dc4a1d58---semibixumopolujatejala.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41175cc6a---gizuvojaw.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_off0000d5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 18092 bytes
SHA-256: b54e7279b5e02c16b9d8a1cd33c304f1759e0a591daf472cb5ff6c2644541eee
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 10900 bytes
SHA-256: 8257abb825f37685b609b15b9bef8231d75859b6224fdedd8a181cd192639d87
font_02_sfnt_off00011ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1