Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4d3225d2f39441…

MALICIOUS

PDF

75.0 KB Created: 2021-09-02 19:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99b61fc6690dd17dda105448bbf6ef24 SHA-1: 316d50da547d031c08180794db91c540682de5ce SHA-256: db4d3225d2f39441f18bcaa2499a765d4a1bac45a141f6f5cc55b15a8d0312a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fa6f9d0b3faff86e10be09cb2314a338/7413753449.pdf In PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/95370aac9c1f2bc78751b76b593f29ce/rewipi.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xirugaviroxame.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bee50903ef2dbc0c5609724fed3540b7/xapomowolivulopowufobuvi.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/43755099376.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/gowof.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vee7ce58mn2hovjqt12qpsti2t/38053594162.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/ropefotoniw.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070c245055e1---64860377956.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/989ded1477f20d6d510ed0a37bea8e91/kogisemawewofovunekes.pdfIn PDF document text
    • http://amandamaitland.com/images/file/60286537352.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/kulabivupubetuse.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210603092232.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/kotavuzirez.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/19707026551.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/vufolefugukamupebo.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/72055065664.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/14765616442.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ha4ha5mpv1ij49rto6omps3vka/gejip.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6577b90cac---suzinirazejut.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0c008e758165ef193fb4e4590c2a6534/sijozadazibunugamube.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/xakifewo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00439c953---53427727023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=go+math+florida+grade+2+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_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAE 10832 bytes
SHA-256: 167fc6756b070f95e64d2469c852b9531c16c9e7515b1d686a9a1f1ed7909968
font_02_sfnt_off0000f37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37A 16608 bytes
SHA-256: a9961d0e097c9e3c8c9b6daa13435de40cda01f2cd4c8da62a26521bb3602c66