Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb0d7f616d9b655…

MALICIOUS

PDF

85.6 KB Created: 2021-08-19 09:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6cf9e2ee3bff6cd8833cded16e1df040 SHA-1: 8f5a795d2685eca332e6df8d243b0acdd4425326 SHA-256: 0fb0d7f616d9b655c5d7c41de8b66f19883fd6973efda0de9ca6e0f216ae8ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains. The primary purpose appears to be directing users to potentially malicious content, such as phishing pages or malware downloads, leveraging a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=sociedad+y+adolescencia+erik+erikson+pdf PDF link annotation
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093671e55bc7---82444624677.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/51903409695.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607052b071b26---91655795012.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4b6d92dea201fb4a295ae627e088f7f1/90481933309.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/waxadabamivuro.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/98659656951.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104051dd680f---wibiredilene.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e176ce3d350722e30d67570ef0cc5bfb/vaginozemevuwafegip.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/dde6f2a84b25ed563f6dafa05945b402/94629840491.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/sowonokisosovib.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607196e5aba96---75576745650.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608844877dffb---bisaludowakinolumamo.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/ruwelunolojetopusovozif.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/06gn63gu8i6kqdegusvhqd6j7k/17418772703.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4693951d1b6702a20b5771e591d892e4/vojewekasojitusik.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608493a32d79c---letinodilepi.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/19161023279.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/72556068708.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/13551c3e36e2d3bcdd0583687a6d82b1/rebak.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/piketewipevebo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/48003472768.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jukulukupi.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/watititemofegawasifeka.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/70732934523.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/76253185912.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/ripuriforiworop.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_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 10796 bytes
SHA-256: 35fcd435234f4885bd195c4582e782e3e5558ff9b1139ca08b77497e48b95310
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 18536 bytes
SHA-256: 4e974187813efc68da9338982d6f3bd280a65e563ad8946981a8f5589b085c34
font_02_sfnt_off00013059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1