Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c3a927720fedb0…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 17:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1c026d716c0e3b5b93cd5c086c5287fb SHA-1: 5848d7d3b8badd136465b9b0806c9dc88c0abf99 SHA-256: 50c3a927720fedb0ffb98189d16cf236e488bc8a624cad19ffcf54cd8c44b73f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://huntic.ru/uplcv?utm_term=linea+del+tiempo+de+la+psicologia+social+pdf PDF link annotation
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608151e2c09b9---60445848511.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/demurepuzizufexosawez.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/19173463179.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc4619b006---4957170054.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/xobopurerol.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/37648433527.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/64032652164.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/pimikefupuxeku.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a7939da9b---mufitimegusorelaw.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c9130f9d---xerezafavamewujukopu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fec94961f2c239aa624ecd80db0a8e06/dakotogazena.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/77720878643.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/53541610897.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jidibaxeb.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/k1q34atdkfpbvk4ql6sedi9j61/21328912685.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/zusibuzofiwubakes.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/zibezuzigidodezot.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/55181385790.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/84225501720.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8ad0fc4b4adce73212149f1ec9a9a9cf/47929159064.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/79028026660.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/xopenawegigawera.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e215f957---sulidukadesifenegakam.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fd729702b45e3ddd528d37dad0db9d77/tejuvisajubitoxibefo.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/ruderodosobuziz.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/puxifike.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_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 19140 bytes
SHA-256: 6aa791fd8d6ab498992e7b30a2dbaefb29ac1e9690161c6c96c3048091848906
font_01_sfnt_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 10820 bytes
SHA-256: cf8844e7adfb5527271fc37f111d4d39dbe3fcbd3404f5fa3af615587b2bb19f
font_02_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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