Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef07e92de72fd15…

MALICIOUS

PDF

87.9 KB Created: 2021-10-12 03:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fbbf16abf519dc8b5fbd29a8f229a06f SHA-1: bc20e81c541118e5c4be428648276642ee574034 SHA-256: 2ef07e92de72fd1522719f5d68cc3f52efc099fd9f08e82ae03eccb69e2471de
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://alrabbancapital.com/file/files/dobixezatex.pdf In PDF document text
    • https://ksdc.in/userfiles/file/98269960618.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/sonafujeg.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3043372215ff4385bdf26d1d0ed96fca/niwofomewolonebovokoxu.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/59441128625.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/30326081819.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/12857130116.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161376d6a5ccfc---gurexupabavuviviwetetoka.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/wuridipotoxosi.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/zugosomugogitigarenojew.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/75b0bvdqanode9auru2kkd23hc/79842010676.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/93263884699.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/16173128287.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/52656291496.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/98492359316.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e54717bc1---24787998176.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/18245329967.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/fadubi.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/70343961892.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8shlqk74f4oiie7oc7cbm3287k/mesusivo.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911195722.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/45379969234.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16163718f31af9---wetakavos.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=how+could+you+quotesPDF 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_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10344 bytes
SHA-256: b4a29e98504a4907f3216cb584244c81700924ec6593db3065e97897d3b6b0a4
font_02_sfnt_off0001211f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211F 19008 bytes
SHA-256: 160d81e5cd4c3c13cc44388aacd696175a2b05b93f4fdd0dedce04c14674ba3f