Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb55ca2d5faf50c…

MALICIOUS

PDF

66.5 KB Created: 2021-09-21 05:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86f3079f1f4f31629d39c97860364fec SHA-1: 02be5b6a8cc5b7c9f8b443753b9c1995fdce0e7c SHA-256: 4eb55ca2d5faf50c17ba0ba95bc8f7920424fc09edb6e874f1e7212f4b692b46
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8294

Heuristics 5

  • 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
  • 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://wedding-box100.com/uploads/files/202109100223357987.pdf In PDF document text
    • http://limeitec.com/upfiles/editor/files/lunepobobuvofobukav.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bugagedopup.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/didusinisajepepilalulu.pdfIn PDF document text
    • http://change4best.ru/upload/file/namemukuwiwugukaxa.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/wazijel.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/a68934e9fb96a8f27b1a2daf8b196900/bavuv.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/rodipejepanisekimoke.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/66718299731.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/fowolusexufizev.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/geravovolabobejo.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/vomuvefidezoked.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/titafenegadewijokul.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jobep.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/badome.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/35579086172.pdfIn PDF document text
    • http://gojjang.com/uploads/files/nonixezifoxi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/50733653579.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/luxenobaji.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sutigevawabekowisukuse.pdfIn PDF document text
    • http://imoroz.by/upload/file/zusudikovulafavevej.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/remutofipobunofirapibev.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614621193e31e---fuxafavafopimuxurajopan.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614901a84182b---82751691552.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=competitive+ios+gamesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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