Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f5f65b157dd64c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 18:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3f055500b174bb0587d1dfab13f5a0f SHA-1: 7315e1f32aca93a673102cc8a341c86e31f2a853 SHA-256: e8f5f65b157dd64c84abdad44d15fba01645ec0abc4041897dd9df28820bda44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to potentially compromised websites or disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely responsible for the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://firsatpin.com/calisma2/files/uploads/8311041892.pdf In PDF document text
    • http://cosmoscm.com/contents/files/rewodileberifibojiwuwebov.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/49295871749.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/jusotojosimex.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/13641254746.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/lapuf.pdfIn PDF document text
    • http://airmon.hu/images/files/vuxufu.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a15bf07d49---83611402971.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/34780132705.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131b920690d1---mivagimevaxorisusupulibe.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/40485604985.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd1b6d36---kubafadupo.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/39681916390.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/51202606842.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/radutu.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/xemakozemidog.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/27049190907.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/rakovogopinekukigem.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c97a04593---rawifalixek.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7b1bf74f---21918154458.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/fadujiporaxopajoxuwimate.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/volejiloperutum.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161332cbf1e21c---15624311854.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/rofakolunudekejikuti.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/masologidudopomepefinix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=500+idioms+and+phrases+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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 15152 bytes
SHA-256: 5d9d9a6d744a373df910ff22f4c0d2dd1de5c62887dba0a0b48ffb1fa596e049
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10780 bytes
SHA-256: 7fbadd03fffc67d27cb2c96fd42f146db3a20aa6a47d0513ca490a2020efb830

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