Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb81ae37ff62d048…

MALICIOUS

PDF

97.8 KB Created: 2021-08-07 15:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 83543b41377ee07a3c361faf571523ef SHA-1: 1721015586063e7111572537d10bf727637d72ed SHA-256: eb81ae37ff62d0484d9b00f498bd9b0a017c2d5699fc97414ddbedd186cbe64d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs, including those on compromised CMS uploads, suggests this PDF is designed to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b4210e78b1e12016b6a1b053985bebb7/geladezigom.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/b580c371a3043489b66d45e5e009b3af/venodezigat.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/weponobitifotum.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1f6ec5e4---tasomimetu.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/35254453372.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c40738376ab---rubobedijebevixapodukamu.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/6798972482.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210603093713.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/36226981619.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/vilolamunivukadojeru.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17e2a8fe1---jetepirojo.pdfIn PDF document text
    • http://someteme.com/archivos/_20210628090317.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/rozotojefojimubajuwasomi.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/521450979.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/64a02ca590db23a4a5123fe173927d7b/22206312093.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/45on1am5rt3onkbibpfbsk8cal/kujeferevuvexatowibu.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b71c03312a---dagogidibekebuvabiwug.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/zanideguxejowagor.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/59256234315.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/suzuduf.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jozobe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a32189c2f---83405857691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=drown+junot+diaz+fiesta+1980+summaryPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/37701377742.pdfIn PDF document text
    • 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_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 16796 bytes
SHA-256: 056f981dfa30ef686c3d76d876710dcee2a1666cf9bc00f6a161829161cfaa64
font_01_sfnt_off00014661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14661 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E78 11508 bytes
SHA-256: 7e30249fd41a63b2f4dd4f6eac63603fe3951e6512e2cb3f9bff4569f255e443