Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf7e948c5161a592…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 18:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8935c86bef9d1d994fba3f9746c133f7 SHA-1: 65248c7271d922c8118c6853e4e38b948537985d SHA-256: cf7e948c5161a5923b5c657e0a6ff2db927d9b376d3ed7be70f3153dd048aee1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDF files hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security scanners. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/b8baafda4aec633569f19fc8f64b8077/tepeli.pdf
    • http://travelport.pl/userfiles//file/13665697437.pdf
    • http://beateromer.com/bilder/file/44139893124.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/74739627089.pdf
    • http://topcudental.com/img/userfiles/files/piwexuj.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lb1ujekinl4bjnth8q4vlsamoj/damemamiwexabutejuxipa.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5fb5442909b3ae45741ba6b4250b05e3/84600218360.pdf
    • https://gulceoyunlar.com/calisma2/files/uploads/gufita.pdf
    • http://innotec-industrie.be/userfiles/file/97491535920.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba943fba463---56630810964.pdf
    • https://aawyx.com/sites/default/imageuser/file/2547479364.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be135dcba55---24045898775.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b353c345107---27659702810.pdf
    • http://garderoba.sk/images/_file/romeguzulavab.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015ca5d16d---napexozamesasuduvasojeg.pdf
    • http://whewfamily.com/clients/12004/File/15106098204.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0066e9f658---kiserazaredudewofefuz.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a860ba9258---risunovasalokunuvu.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cd354b45a78601776320dd1c8c00ed0f/27396453888.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607400e0f18d6---bevuxivunezi.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59c1a6e5fb---gimakapuzipes.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aacf408a7a9---74855084733.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcsucb3lf1amihsqo8cpsahtg7/61361331433.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gta+v5+highly+compressed+for+pc
    • 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_off0000f502.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 16792 bytes
font_01_sfnt_off00010d19.bin
a7fc551a7cfbeb8333fcbe8a9522b1dbccfb6d15b4f0f393f59ed67a4523a064
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 11316 bytes
font_02_sfnt_off000127a5.bin
515a903320819a1e846eea8a6420c55464f6cc82f33f68c9588f8532a56d5b59
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 18144 bytes