Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66fa1bd373c9740…

MALICIOUS

PDF

92.5 KB Created: 2021-10-04 14:31:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 20405e019b76c73641fa6cbebfbd0b6d SHA-1: a87fc66eef23c0baa8215a920623be79681bdc98 SHA-256: f66fa1bd373c97401ab94f507b4e785e70c6ad04dfd36c3a0a640e4cb4381045
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://alburigiott.it/userfiles/files/xizabixavesazixuzuxobubo.pdf In PDF document text
    • http://0-50.ru/userfiles/file/mabujavezugubibupotu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20211003_D8AD88A3DC623B5E.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/45120520138.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/57907932260.pdfIn PDF document text
    • http://186086.com/upload/files/vudodemetaw.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fibanegufasagur.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/10977220889.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/degixulevapes.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/57158754179.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145bec5c6a56---18134343434.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f1bfa0ee64676027b65988c0a8ebb687/39273986669.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/pepogaxunas.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161583ef1d7bf0---kixazi.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wasikipelafom.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465f784d762---3418071386.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dda44a573---14561372883.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/48401358899.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/62412089434.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/56462072946.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/dowobuzogibebutonevor.pdfIn PDF document text
    • http://betriacum.madteam.net/ckfinder/userfiles/files/33369224275.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/61da0a589614b818cc80c8afe9293015/95997665751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=site+of+protein+synthesis+in+the+cytoplasmPDF 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_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 19012 bytes
SHA-256: d27837139475fef23b47b003ffdb2164533a6e0c553c9061629635d34971a170
font_01_sfnt_off000132af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AF 10936 bytes
SHA-256: 7c1545ab0754fdfaa1623b0069b2fe95c8d888987617c749f68991c344d9e33b
font_02_sfnt_off00014bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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