Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4bc18c67bf9cf0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 08:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3781a03c424b0eb383032da86d26ae6 SHA-1: 4e955a23f6f91dff5bdc20b7f4a52dfbb58ff571 SHA-256: 1f4bc18c67bf9cf01f1ada006d931f230b38c87bb2d786fb4087ac49d5874886
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites. These links appear to form a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16105e4d47825f---vukibukizuzuwurejoxinaro.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/76558690085.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6e2d652a9---71857235200.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd29e5d9ab---75924915530.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160759baca6bc1---pasafesisaw.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/xamunopev.pdfIn PDF document text
    • http://africareview.in/userfiles/file/wafonim.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/pisosozatu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee419acc72e---funopasuxolidepajodum.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/dilexetiba.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/74925170492.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c001703aa5---vaxenefinemasebakojo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/fedazigubas.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/84144550372.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc81dd561---gugatagunalodiw.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9ac449299---6570356506.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/gozemijuvotop.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/91329120663.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/46575005513.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/fcb557f0967c15d4227b375c2a20a599/mefiwigegukakelibaribize.pdfIn PDF document text
    • http://fabtur.ru/upload/files/lutorafiwo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160983c0110623---6498817143.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/zipozabuxowapep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ford+fiesta+2018+repair+manualPDF 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_off0000db57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB57 17160 bytes
SHA-256: e50ab6bbb15ed8132047bfcc5fe1d0515c3cd88ca0cefc75169f1c14c4b49482
font_01_sfnt_off00010843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 11236 bytes
SHA-256: 8ded64a1b16d407e9cd1b0d513b66796f265a42f4614cc12ca3b2ab1f38a42a4
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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