Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e95fe406c189c61…

MALICIOUS

PDF

87.6 KB Created: 2021-09-18 10:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 721fc2abe1f1a1a9579d162f3a941a96 SHA-1: 8a3cca5383ce9837f058e2166cf87acdf1d7946c SHA-256: 8e95fe406c189c61660cad64b998eb449c2eded93e1fabf1ec273d27c929ce4a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=euphoria+season+1+episode+3+123movies PDF link annotation
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/k60jls7fjjugtlpo52f4jt5fho/kefujutopaludav.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/tinofewezimixavopuzu.pdfIn PDF document text
    • http://belloverde.net/emailer/file/3738107083.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7fbf8f0aff24bd929b53129d60e7cbff/75427057799.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090215364236.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/13578778187.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/36676188525.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/sajazameripuxu.pdfIn PDF document text
    • http://christopherdallo.com/file/54343902941.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/92521460454.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jimuxajigogixoru.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/viduguzuzafife.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/wugewimaju.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/kunanijojaken.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/12045804389.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/35786892649.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/rigomojenalizulixizux.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/puwasomu.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/45180879500.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/67652084450.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139dca3395b6---fotufopisizimijuze.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/6286566675.pdfIn PDF document text
    • http://runhouchem.com/upload/files/sifebubivufi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/sigajupafo.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a694d9de---18145716992.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_off0000f045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF045 11004 bytes
SHA-256: 3456e60c0743379647967d93bb044c28367d7f51c3615b26a10931c984317a86
font_01_sfnt_off000109bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CD 17988 bytes
SHA-256: dc25480ff8a620ac4277554496dd54026b2660761ee4cdd2622d706d3765121e