Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de632b9e819971c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-02 03:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e52bd31f8d03eeddea232359f0bd9366 SHA-1: 50c31b2edf9cbbf7546df2b2fbb0c0b92bd773bf SHA-256: 6de632b9e819971c09e39b98ec6077f0fce0c39a41ffe414b1a28ac8b8e692cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The primary goal appears to be directing users to these malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://inwebjor.ru/uplcv?utm_term=stages+of+conception+to+birth PDF link annotation
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/91586936476.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zakogexifoxoduz.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/5346032741.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/valekuz.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607054ba3531e---73875644475.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1eba869e06fb2ac690a9875395da1e04/47946019141.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9a4b2420f097cb90f0c238c4e8f7c3a4/mamekotig.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/69704557267.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-28/20210828230945330719.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/iuvilhbpo2uvquuugpj08eadd6/bitamumu.pdfIn PDF document text
    • http://naviway.su/upload/files/rumukekorewom.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/34903288473.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/3554b95224e78b73b9aa0a9a974a5706/17660524262.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4a0f208fd4ce0dd0f94170b28fd52277/mosigisunuzefamiz.pdfIn PDF document text
    • https://webmenuplus.com/images/file/zejobelegu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3f6438a0---83758769917.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/50406429515.pdfIn PDF document text
    • http://anpo.vn/upload/files/nemanumelezoreguxegij.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/kolutavo.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/776c9216f772512258fd57afdefff9c8/kepesutobikijuxagapot.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m0cv3ntkj6fjgcpqo9hl4cbfou/zilusakapetejixos.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/59551861666.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b4e33da2---33432972681.pdfIn PDF document text
    • http://underworldgear.com/upload/users/files/migekugina.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6e1c16045c0dbc11847bac5242419af2/18987662904.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93f963523c---76420038732.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 10928 bytes
SHA-256: 221cb14f8a002ea032331a727f1a537a1365a339b94cfd3f0f833f192bcc69ce
font_02_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 17728 bytes
SHA-256: 5c9da16da1ee8b1758e7b461ce95bc8bc4a82c68ca500bbd581606a9d698f25c

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