Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2ff708958e3d6c…

MALICIOUS

PDF

82.0 KB Created: 2021-08-13 06:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 55c58bcbb55c987e40573f8401e73196 SHA-1: 1d830f4727413ceea7af735ea515e72d108384a1 SHA-256: ba2ff708958e3d6c3d777bf57614be865038595870f1aee04fd62df481c59a23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The `utm_term` parameter in one URL indicates a lure related to 'exercises pdf perfect english grammar'. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/uplcv?utm_term=will+and+going+to+exercises+pdf+perfect+english+grammar PDF link annotation
    • http://pdww.ru/ckfinder/userfiles/files/83817803314.pdfIn PDF document text
    • http://contelex.it/userfiles/files/wababotupenijapunufonev.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/69342230501.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/jokizetazuwipatebe.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/6009835228.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/b036c2f19622c97e6b28d16683fc9ffb/85327871960.pdfIn PDF document text
    • http://rhondachem.com/d/files/tosukatena.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f7993dd69ab---20705518339.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/77914771383.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cdfad7e991b184889ccba3beaa3d4cc2/65381316962.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/47893700248.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/92425930016.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/lopizodus.pdfIn PDF document text
    • https://schmitz.cz/res/file/tepirolegujilumatexax.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5028894a1---ludadosulewavegewitaw.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/woluvesowewovagobex.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/18231896826.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/59979276223.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/35265a5c2f2f245aee3a1105c4aaf56f/gerenemujavik.pdfIn PDF document text
    • http://www.hmcpacking.com/uploads/files/483322264.pdfIn PDF document text
    • https://samowar.me/userfiles/files/vadoxonulizevip.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/bididaresipaf.pdfIn PDF document text
    • https://avela.md/userfiles/file/genosikapototifama.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_off0000d941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 17248 bytes
SHA-256: 74cbb62f116690664e95d80a6d0e8205bb53b4f2c67e8f6f89e9a54875fa902d
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF7 11164 bytes
SHA-256: da2e62e05b72fda8f6ea6b656880a4d8e0ffa723936f0974c6e2ca534c5028f0

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