Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2ecc47fca036cd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 10:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b82d184c1173213c4ff71341b4226ca0 SHA-1: 872fd62d0b6ab7d099bb152a8e10f1e8dfefd657 SHA-256: 4d2ecc47fca036cde6217e37aa3c55c6449f5ff0a1eed2c7f65adef893e05639
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this analysis. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=android+how+to+check+voicemail PDF link annotation
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/63638547104.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/67685736573.pdfIn PDF document text
    • http://ipceurope.be/assets/file/ragasekeguviru.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405173c6ba6---tujemibi.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/gogigukipes.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/326b00e759e5eb63104683ca40879960/63668971935.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff443083a2---nevibufaref.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/zatas.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/vogidurefiki.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/42921146340.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/bopesopabomileramuwidi.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/6396397981.pdfIn PDF document text
    • http://lecostationery.com/files/file/kipajib.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/dizejawakadelewerijab.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/7420353949.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb14ad8845---65789421174.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/raxejadi.pdfIn PDF document text
    • http://chicopharm.com/upload/files/lofumuzogopupesugu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/vovelut.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/fesaluzudolewibonejopado.pdfIn PDF document text
    • https://subarini.ro/mm/file/16508683107.pdfIn PDF document text
    • http://scarpatti.com/files/301018032.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16145b53d521b2---nalulefunajew.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161340f3720dae---zadokixad.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_off0000b30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30D 14828 bytes
SHA-256: c38676dc09d4d0b14f03ac2f905cc2b8f5d138e4faa61090713ed9c2a19a059f
font_01_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 10692 bytes
SHA-256: d36898583b82c12c51b0ff3024100be06238a25bf0af8bf3547a3a253348d6df
font_02_sfnt_off0000f097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF097 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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