Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ee725b1d22259d…

MALICIOUS

PDF

69.3 KB Created: 2021-10-01 07:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 53b7c4c16219f07e19704d703d72cf44 SHA-1: 84e86edf2585101080fdf5fe2bff7c088cdbb5b0 SHA-256: e5ee725b1d22259d08ba1e89f134df7ee0fab3cc9e5a2adace00655bdccd429b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be distributing malware or facilitating phishing attacks through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=wonder+video+pro+apk+download PDF link annotation
    • https://zenmobile.in/jaipriyart/uploads/files/55776037408.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210911110245_bfl6vc.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/zadufug.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/27490227332.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486499e5157---88872308894.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8cf617b9---8417568059.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/tudimovar.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/95544258382.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/sexawudokelugotolilowu.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/vubunirebupibeken.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/fofatege.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/28673531686.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614572e93dfd5---59203610565.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/38355820743.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb12cb15c---sevaperexotedisawupe.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/sagurufinolofogixulo.pdfIn PDF document text
    • http://rts-3.ru/upload/files/48565346188.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/97141346784.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/89324217150.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/59698922681.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/69442743672.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/3254763233.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_off0000ace1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACE1 16448 bytes
SHA-256: dc1ffa28be7a289cd458d3997e3297292fda032eb976bd87c2761ff28bad4de3
font_01_sfnt_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 10356 bytes
SHA-256: e162526e175c05d7893dcf6f83287c3bb39d6577b4f81924f4b59aa0c3b8a9cc
font_02_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1