Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefe25b5d31aa741…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 20:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8844dbc7a3d955585ea2473d66121a1a SHA-1: 48b590debdfee45e23cb3d92ef6da70eda732711 SHA-256: aefe25b5d31aa7419f173fbe4c1f7e50c3b105e83fa114aeb54ee8adfdb9c04b
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 of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is likely a link farm designed for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd92b09f1---69429041540.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b6d6b7d9f---delotof.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/86196510545.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/67021700985.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2860a04bb665dd6b1e61a4cd1f4bd0a0/tamuzodozelesake.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/hitfc2hbc6utgteb4v29ae7jf2/66409645632.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a9954bd38---91342321717.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609298e5d4dbe---wiwodufawotovoxevirozij.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/sezobasijekez.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/77081605604.pdfIn PDF document text
    • https://ancoraeducacion.com/images/gigupij.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/e68ed0edb98ef02c050edd991ec1ec1b/rexiteridap.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/perisulajukunizumikolu.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/vexovimabeleforenupakugif.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e8914b5d8e7af9072da257ef214f814/tawerijaxiluvu.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/kedekajufibunaxadewetope.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/89138569115.pdfIn PDF document text
    • http://fitviewer.de/files/file/9756463405.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zewifameb.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/funimekuzomokasev.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/95021668958.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/808507684.pdfIn PDF document text
    • http://ccshecea.org/upload/files/vovapomivifiwetemevupaj.pdfIn PDF document text
    • https://arendic.cl/files/3027148064.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b93d14e62---koxojewizipi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be49f108ce---zikasebij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=osteoartrite+da+coluna+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_off0000e129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE129 10736 bytes
SHA-256: 78c0bfd9e5c5da4e91064d01e75abc857d720967ade462679067613194cbfed6
font_01_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 18432 bytes
SHA-256: 54fe3f07a704ef51c64b2bbcf5b6da5c7beb16133f68249cbdfcdddc3ff66283
font_02_sfnt_off000129e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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