Malicious PDF — malware analysis report

Static analysis result for SHA-256 8906a58e3fc30612…

MALICIOUS

PDF

93.3 KB Created: 2021-07-25 00:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b4e304dffb75c58e5bd91a97363e790 SHA-1: e40b70cb849ab37d19523e445d4c56e237f260d7 SHA-256: 8906a58e3fc30612e30a7414fa1c58dd999beb1f7071d33c4bb6f39369d67bd0
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, with the document acting as a lure for a second-stage payload. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://master.plus/wp-content/plugins/super-forms/uploads/php/files/14c13c0e42206b63d54a7706c3cb29af/wadilow.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/883034969be708f13c87cffb63feb63f/soferalavegogaxitek.pdfIn PDF document text
    • http://ridendo.cz/files/file/muxivixofalulilonikofovej.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fuzagepejanegivaj.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/ronugugeminomufuwofokuzik.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/taligefokuwijukoritiwur.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hgg6loeec4oe6bdmfpnnndepdo/pojidusanomowezixesa.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/venudumobazet.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/zefotatugenumut.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54bdcab463---xiwikogekasebagikibigeva.pdfIn PDF document text
    • http://wenxuezj.com/images/File/rufefawawawipipikabepe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ca8d6bcf7---vebotezonelumaf.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ls89ic833rfu75l1jkbf2ok534/zamujubeka.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0934b3748---kaxeraxogiveretozemi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fbccbc951---20756147061.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/7cebdf75b472fd36c3b526df4e81fd79/18590963616.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/955bbf96e6f7595904f25adaf079257c/dekapovimapegipibu.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/lakixinume.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/56799557595.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2106290313419940078d9ag8.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/90515208493.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b384639608c---33107425582.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609414977c50e---pexoliwusugosajob.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160707f0f10243---62100438644.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/65244225692.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c27477a6eb98d89bb0e842d329e71d30/92597054826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=como+encontrar+mi+android+con+gmailPDF 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_off00010575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 18612 bytes
SHA-256: 0c56068b6bc1a75625501da3cf11b805353433b964ecee9081a3c7bd725ba88e
font_01_sfnt_off000134ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D05 10576 bytes
SHA-256: 982b71f5aa5c4fc7113ca71879afe26b6947ce76522d8ada13f1fa1470952c3b

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