Malicious PDF — malware analysis report

Static analysis result for SHA-256 b367bc79c8690337…

MALICIOUS

PDF

91.8 KB Created: 2021-09-01 10:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e52cc31b441d49ab3bdd2e35cccc343 SHA-1: 16587c1b1209c3ff634778e0cde712587c3237c3 SHA-256: b367bc79c8690337610f679cf666c1139bb84318663d8a88824348759e291be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs confirm a link farm designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://zap-interactive.com/uploads/files/bewuxokazekufugojefo.pdf In PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/giratabijigu.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/jugibima.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ced95c8e---katozifujozonadaw.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a092f550d65---witezefejoxaborumig.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/kusin.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/39085436324.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609b679a8372e---26963567246.pdfIn PDF document text
    • http://schokobrunnen.com/idata/47064195491.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9197866a006d1a6a96694c6f87eb87a2/1536846845.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/ritivalumotazibidaninewaf.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/65290671190.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ddb46fa31bfb277fd87a059c204c25f4/9545943165.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e87c795---54343618758.pdfIn PDF document text
    • https://dintek.eu/uploads/file/85869421341.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/aqld1b4vsvibeoba6gu7jva3j5/kexuxaxupawurawoler.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c610073a182---fezepodepujofob.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210810_170533.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3fbc5066a66e862a3a7b425ec22a2bc7/dopemojawedi.pdfIn PDF document text
    • http://htwy.com/upload/file/2036159779.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rvbbqha8ggbvanp8b2kf6cv3be/77441956779.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/f73f59e35c3673726e04e81d2bf1b6c4/tufinuxefapasile.pdfIn PDF document text
    • http://falerisztika.hu/tmp/9350309376.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/3iii88iv7427r15qkgcas33t4b/bidipavebep.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/24913599644.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/jidanovopamodol.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893b22cef0a---kiwisikakasinuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=greatest+accordion+playersPDF 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_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 10660 bytes
SHA-256: b0971524474730faae0ab64a9eefe939178135ce8b0e4a2457c41d37f1d8a24d
font_01_sfnt_off0001185f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185F 18860 bytes
SHA-256: 8884354f03330010f04551daa174d358dc4cfbae69d07e0da42a486a0c2b8d37
font_02_sfnt_off000149d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1