Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67964164ce079d4…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 20:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e27258aeb439d783c005c82de124558 SHA-1: 3b91e3ad68a81f6482013cc726cee4203a60c8d9 SHA-256: f67964164ce079d4ee650b8ae5d3e155b3576dcc9ddd6f72e4f1c244931ee8be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content or executing exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://coretry.ru/uplcv?utm_term=good+pdf+reader+for+windows+10
    • http://cegled.varosom.hu/userfiles/files/99164821407.pdf
    • http://gemculture.com/userfiles/file/9607944242.pdf
    • http://k3projekt.pl/uploads/userfiles/files/norinixofumok.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/54782836283.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/tadukenukofibupepukav.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/et975mguuud8l6dqsv8vsmqln4/24425476349.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e71c7d605---wesagopanowabejovopiba.pdf
    • http://nasfthr.com/userfiles/file/13294861856.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/piwobidovixotodemojero.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130acf82fb51---pesupetiv.pdf
    • http://hoinhikhoavn.com/img/files/wotemapimef.pdf
    • http://livestocktool.com/d/files/lezivojegozoleboziwepuje.pdf
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/15831062341.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161313aebeff9c---10717263503.pdf
    • http://abwninemile.com/uploads/files/mulozuzopel.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/pazibesuxemasovatowez.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146176bd0295---94904045773.pdf
    • http://romangruszecki.com/uploaded/file/37312600036.pdf
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/2267791877.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130ff524456e---dezoruk.pdf
    • http://architettogherardi.eu/userfiles/files/91029584101.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4e5d94b2a76c108ec0a246254d862dd1/43517866768.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b656.bin
3d253d7830416e9d64617293f75451a47a869221698a809d5bd4d00cdd8c3ea7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 16216 bytes
font_01_sfnt_off0000df8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8E 16792 bytes
font_02_sfnt_off0000f7a5.bin
d459efa240ce166cf580596b00200c2bde2b2d1dec7d25502a7a499109305cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 10648 bytes