Malicious PDF — malware analysis report

Static analysis result for SHA-256 a333d0de0538227f…

MALICIOUS

PDF

83.0 KB Created: 2021-05-27 16:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e19c62d92c26b538ed4476bd6beba6 SHA-1: 5894b5b08bcc95cb8635fa8787f550cdd85e9aeb SHA-256: a333d0de0538227f78585168a97c2031ade5a35f5f2da22579bf71c93b327727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ddebf0ba5727ff5c1aa649538fc1d4a5/5693445338.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/11db8859bbc7d26e9e05cefbd3c09713/50691352426.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/00ed8da639c067aeae3291da83815b02/34674264115.pdf
    • http://dlt-nkp.com/fileupload//file/luxemabovodijijadozipomek.pdf
    • http://proxima-design.cz/files/file/47475704255.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kg645v1qgre9dna1b7jedtk50f/tutari.pdf
    • https://zold-kommando.hu/files/waxorumimokagirowesesuko.pdf
    • http://casier-a-bouteilles.fr/file/rowanodijosam.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4efef782---wozota.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/dfaec1f15579741626c1fcc701fddc67/88172174746.pdf
    • https://alternativecarrepair.com/userfiles/file/pevixe.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/bf37bdb6102ff6b7b5e9d70eef839697/zujag.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8baad162c079454982b4c1a92cb635ce/64704199049.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d042ecf99---zuwikaxobe.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9e9a43559---sewuf.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/32521807901.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bill+book+mockup+free+psd
    • 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://scripts.sil.org/OFL
    • 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_off0000efd7.bin
947a3356503d28fa1645bb0fae60a121ff1292e32d74dae01667ebb765267f23
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 5344 bytes
font_01_sfnt_off000101f2.bin
a1a4c54454d54faa54417ec135cf4837c90ccb55a320eeb5efb79a49912ab397
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F2 12104 bytes
font_02_sfnt_off00012969.bin
00468df452218f546d59995a7cf9b4297092e2fd476dbd2f6ce79846bd051107
pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 16140 bytes