Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd41a4969a315c8…

MALICIOUS

PDF

87.7 KB Created: 2021-08-20 15:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 1c0eff5ee44670d9ec22ca90992c0d09 SHA-1: cbce4fe4f7aef2f0b9be324880b5cb78324f8567 SHA-256: cfd41a4969a315c8f3d9839629613cc17da103990d7a9a08b2e0170cb958e0f2
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to external, potentially harmful, resources.

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 http://younewstoday.com/task/userimages/file/basezolotakokozafijakufag.pdf In PDF document text
    • http://ytbozhuo.com/upload/file/311407504497.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/dgvqo3rben9hnabh8jp4m4clb4/22028685059.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/bijavetonimuxedewagoneka.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/dirolida.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fopijezil.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6e719f75f---25515849440.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d44f099c---sesusobekonapogeniwivazo.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/zuvexepitovagep.pdfIn PDF document text
    • http://gptools.net/userfiles/file/viwuxuxoditasafab.pdfIn PDF document text
    • https://businesslife.com/content/files/39343482308.pdfIn PDF document text
    • http://klinok-saintp.ru/files/pomowulijevimafapegeja.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b609fa3873---9632297513.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607457d2359d2---47214290610.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f367f13317---gabokelaluvozina.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/34225859723.pdfIn PDF document text
    • https://digireg.nu/upload/mikijunigegirabumafapuva.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bcbacdece4d6f4065dd1e2c2539b851/64606421037.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608610b8015b8---sazatoxu.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16074c91b62965---mobiwibupazibiderefezabiw.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b277c2ce582---fakepukato.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6b74c89d241361eaec012195e7d6c2c0/takezemogamokerumenumu.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/kakakemufuzili.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/01c442aed65a0ae66207d1c1f57cc03d/sotipegeraregiwip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=is+wow+a+noun+or+verbPDF link annotation
    • 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D6 18760 bytes
SHA-256: 94cc4d0960d3a7dc9a4bca5ec7f221e677697b1b24c50137bf1e96e5f4426df0
font_02_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 10208 bytes
SHA-256: 2982b4bec58aaf25f30155714106ae9434668750a1c11979e4a1ed221fd65c8d

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