Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb140863c36266c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 08:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ad064eece575b7a39777aa4b85485c8 SHA-1: 43b28e37c52ce75ee3e36150fc957da865875431 SHA-256: 1eb140863c36266c18b8adbe901567a7361d2dd680f1e0d5b85aaa3d9886bc87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/kcprginr70ijpr7j8a0htpk540/gusuvezapejawubafez.pdf In PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/wazowifavuxewovu.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/gulajit.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/lejumesupatazo.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/81051438340.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8465987da0f1e00e754061f5e47b7765/58191917498.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/mopezetinov.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b438c59---84588447114.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bqrhg0kk3h29rjsb2c8bhcsru1/58341633824.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/dexutajixoliwuk.pdfIn PDF document text
    • http://alptw.com/images/files/nibefuxixobemekala.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160faa446551ca---97603715671.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16109c9617076e---53137383424.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2438a44bbb6b6d7fbce92abc07fb2c41/37975318947.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10df06b69a---79289013682.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/91449283530.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8167dda7be---84738562646.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/gudajududapeto.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/pefuz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ps2rv7ssif0jfdmtvq1u4f7q3j/81193343718.pdfIn PDF document text
    • https://campermagazine.tv/public/file/13328421388.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/m8nk6gq7ulhuu2m6nu99maiov2/56544330060.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/simebudijetesekanadumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=livro+periodontia+carranza+pdfPDF 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_off0000c49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49C 10484 bytes
SHA-256: bd4d0b8d0c023a519745f81fdbbcc0a839516f765a9511d4ebd07695d5405dc0
font_01_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 18188 bytes
SHA-256: c7b0e19b8ec8dcc4b32f88e0c69a3617a81f0d3f067874aaacb10875c1e5507e
font_02_sfnt_off00010b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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