Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ee26f85b1f2a0a…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 21:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 643a945a458600bc916036b1b4730067 SHA-1: 739068dcfe495fc3a178eb974944b584383d38a4 SHA-256: 41ee26f85b1f2a0aa3d8cfc1e90791c2b7d26a3add801c9d23696011b5bf2a17
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates potential for malicious code execution, likely to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 http://euhoca.com/js/ckfinder/userfiles/files/50956708233.pdf In PDF document text
    • http://hiro-seiko.com/upload/files/27492495756.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/5652475212.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/60004108248.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/vuzepafilesidarujilukuxan.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/zevixowiv.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/zofuzivixus.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dupstiokgapcqi4n8vc388dean/17237131742.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/5639671437.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/xolejagidagakugisiwakura.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/60357670959.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/vumorovugobasukajinog.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/6861600314.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64ab8acad---gaguvo.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/47329707121.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/62552955159.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/25916581493.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/tegezagirukizomediti.pdfIn PDF document text
    • https://attack.lt/images/files/19718721062.pdfIn PDF document text
    • http://susutour.com/userfile/file/13161118798.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/vejaruzupuxir.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/912cf2610a7b5f843c6c0d2fdd3621aa/sufow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=truck+simulator+19+apkPDF 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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E5 14480 bytes
SHA-256: c8f78fb34cde7b4a1c6f9bcc771450c98191991fdb67112ca676eb4cc9d83c46
font_02_sfnt_off0000edb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB1 10672 bytes
SHA-256: df42456c3f598967678069433c433b537ebb2709c768233b9b2b5884c9172905