Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6e666a76537a82…

MALICIOUS

PDF

85.2 KB Created: 2021-09-22 13:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0e6752a92e82c9b56636fd4aa17b366 SHA-1: 8e2f559412bc258121571d3589aa0aa7936251d6 SHA-256: be6e666a76537a82f1ba6cc31b3c3c2098238f903cc91c19a50ec71cf122b6fc
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ML classifier strongly indicated maliciousness, and the presence of links to compromised CMS uploads suggests an attempt to leverage or distribute malicious content through these platforms. No scripts were extracted, but the overall structure points to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://www.smpnuenen.nl/images/files/sazogaxupen.pdf In PDF document text
    • http://bamor.org/userfiles/file/39287438240.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/4320666773.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/93751904980.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/20059256149.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff25ca180d---3508752106.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/95116255093.pdfIn PDF document text
    • http://cloverdiamond.com/file/3790719494.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2275dab6c---tedububaluwovux.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/38873634822.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/bisitukowi.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/96135210114.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613167bebc894---45471472790.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/bubinamukudiwitujuxefoja.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/43522302028.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/9481087521.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/54981066282.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/24278549395.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/rududesexo.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210920080406.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/j8k7ipjn8eodctvm8g7d79nc5p/samezavowa.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/xisuzomedipafug.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/zoxefodunusumetoj.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c13e9306e---fizivuvutatukubag.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f92bdf0412---58568427922.pdfIn PDF document text
    • http://patroha.hu/file/82118738233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=drive+full+movie+sushant+singh+rajput+watch+onlinePDF 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_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 18268 bytes
SHA-256: ec6f305063417062f01a6b15518de7ca077fc744eaf6dd5ee93d12c508d843d5
font_01_sfnt_off000111d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 11312 bytes
SHA-256: b227be80a3529d1b642c21aa1097070043afc332572ca3739a43d29d8fde8aac