Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1701b6dfc7322a9…

MALICIOUS

PDF

88.4 KB Created: 2021-06-29 12:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94f6b8dc10445136fe77e4c71e818b6c SHA-1: 55ee25b5adefaee55199b31515c1d7df3dae1e2d SHA-256: f1701b6dfc7322a9b286fe3e3f7bef47b8814ece578a57e8d66b7e3c018b934b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://thebeautyofdesign.nl/ckfinder/userfiles/files/19006098347.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d41da2cf719---gerokaxetovavunebu.pdf
    • http://bannails.com/fckeditor_userfiles/file/56194672308.pdf
    • http://automotiveenergy.cz/userfiles/file/67469761277.pdf
    • http://dfh-consulting.com/userfiles/file/56792980624.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/sesedikewirojixe.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855115b4bd4---fidikimuregasixasul.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/d3285746c81c9c877a78b9bf390f7aeb/zajitiwamagosipi.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160815bf9d901f---nezukewitivaxedob.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/19c2eb72ed45bc90d23c9803dbe81f07/sozabexun.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/eda0e5dc8f76a06475809b19a921c718/56963092647.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/29ef2d1aa4dd421852d3c10bbeac35cf/soxanavafid.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/9917f6ce12d0f516a71569e1c2149c19/97216761164.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/4822439016d1c0be599ffa68b94f8654/47799647399.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/073e0f50298e2c0510cc9dde35df5342/limutovolivimawerinewe.pdf
    • http://abwingsbuffalo.com/uploads/files/43249785711.pdf
    • http://apcmagon.com/userfiles/wodomukamibeginabi.pdf
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sisasovinox.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3c0261920e271f4f6761efbd4abac432/71010306884.pdf
    • http://blpest.com/UserFiles/file/pojoxijupoguvabekax.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pulled+jackfruit+bbq
    • 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_off0000f255.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 16792 bytes
font_01_sfnt_off00010a6c.bin
1df0f5c987e7142a3e2167d6878e6a017c1d76c64ce5027bea0eaeedc5425daf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6C 10684 bytes
font_02_sfnt_off000122ca.bin
8cc96cc750e08261fd3108b3367b4eb22c8f790c22e349fca6d8238a5c0789f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x122CA 18460 bytes