Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de60a3e077daa73…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 20:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ae90319f0f7ff5bbfc4b5fac327b7363 SHA-1: bb4d0f5b1fd3e4642af4deed3a55c288c4e723b4 SHA-256: 6de60a3e077daa732fa1936b8184bcb4af2d66a382fe56bbddd76f003d8bd64e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa16cede0---55358089689.pdf In PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/42831274582.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a81ff0a77183b7a7d0f3eda9adfd1a88/bodifod.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/27foand5qp0to4l9sfu8er5lsp/89429818279.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/116cda6462c46a7d34b477a9f8052a16/67994832774.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/paxuzosevo.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/89465179979.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/13906425622.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/lamofifakutazuvef.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160832cf0a9bd6---kifepegulam.pdfIn PDF document text
    • http://mfahk.com/upload/files/pasug.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b6614119d23786e5afa9e7382b92add0/wadije.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/835431540b334c9e212b213ed4835d30/xetewibobafofetafatu.pdfIn PDF document text
    • http://wamer.org/userfiles/file/39712487236.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/22562541046.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/lipamajejokojad.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63637362e---gofabo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60baa210f---rixasubijezakirizoda.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/pabakoridaj.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/quoctrpb0a5ki3i61fdvoqr9h0/70972143780.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/7694597681.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/o35e7vdd9cpgolmmpogqn79qr0/34210430207.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fomonadexufuvajupakisuki.pdfIn PDF document text
    • https://metal-et-verre.ch/ckfinder/userfiles/files/86512772762.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=janeway+immunobiology+8th+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_off0000beda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDA 15492 bytes
SHA-256: 97a252a95895553ec8c0e6075dbcd6474329fb1be914c126d8878d01638fe944
font_01_sfnt_off0000e696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE696 11316 bytes
SHA-256: fe51647420da01f98a496afbfa0d329ba3ef5ae6c974c077b753c1ac50602013
font_02_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1