Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb380e1f015d3ef…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 10:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8ecbf73a101fbc9ab6f928453c56576b SHA-1: ddf1951bce825d381c42af6976003c194b0a05c2 SHA-256: 2bb380e1f015d3ef3912ab8f96855a97296dcb210587fda2926d0595b68d9196
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate it functions as a link farm hosted on compromised CMS uploads and disposable hosting, with multiple distinct hosts and UTM parameters suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=bf7632+cross+reference PDF link annotation
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/981433346bdafe019cfda3d0c65c55cc/67395371040.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee5980a843---20018441745.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/petazil.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ebmavuui5fi9a515s6ffqlcijf/27919603932.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/42719970602.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/fajejojokuzulurekizozoxug.pdfIn PDF document text
    • http://greenbrier101.com/userimages/66114501221.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0p1te0h02pd8pd9cqv8j0e60bn/47181278544.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/51975465732.pdfIn PDF document text
    • http://yuhongzg.com/d/files/tuludekexuzikarisile.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/filudiketobanoz.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/28524817293.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/nizaril.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/gikobux.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075195d48b22---44811288680.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e7d1a855---31591514192.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774f317c522---59257236899.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/mukofebejipufixogidakop.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/zidugididigupiloziwisi.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da0a3f24cf575854421886c0e1bb90aa/70416527152.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/59580686276.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tufumarevedidonizaguposo.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/96783253878.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/jalituba.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_off0000bf87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF87 15272 bytes
SHA-256: ec74b90cdb8ff345e1d904ee57bf1009d1a89f49d412948b2ecb27b47bcd6b7a
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 10496 bytes
SHA-256: d84070435d5504f6c4bbb9cfb59b253fbe9d4cc3305dec28576356b1ae4798f6
font_02_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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