Malicious PDF — malware analysis report

Static analysis result for SHA-256 e319722387ae0275…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 15:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e63acb6b4d71fa4ccf0afd9ba577bb51 SHA-1: 7bf7ff1ced9f1874ffc4614e4ccd2f8ba5fc40a2 SHA-256: e319722387ae0275f15fba648b5eeae7115e689f35ed7e0e0d3d97d48d9c0f64
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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=find+my+phone+whistle+mod+apk PDF link annotation
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/zejiwaxofiwaketo.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b5886a48d---9128184858.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/wixixozijaxeluxenanunuri.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/xadexademu.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/48592195557.pdfIn PDF document text
    • http://medica-brno.com/files/xutemufujat.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/wegidozagurovopova.pdfIn PDF document text
    • https://stotex.rs/files/81327157234.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/jivom.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138d787cb9db---rilenewojiwanogatijiratop.pdfIn PDF document text
    • http://trubaopt.ru/content/file/92595210165.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133aac4c5e00---34301497875.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4cli231gr3gomv5d38gbsmfq66/lesaligafoberosemesez.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/vavepez.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/jimuwibufefipadixate.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109110033508339.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/tavelibomisuvadamodojibo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/6779593939.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/4763002180.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210918163824.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/buxotafafuwasunaluzuj.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_off0000be1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1D 10828 bytes
SHA-256: 32ff97a08aea0b3e25f7f9e236f32944390a9363d59cf158490903357c2e7af1
font_01_sfnt_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 19448 bytes
SHA-256: 38ec81de8acbd390f5492e344c0dd0848f9043f0cc0aef6e1143b07497b00ad1
font_02_sfnt_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1