Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebb84cfba0da7fb…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 14:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb0b68df2eb6843f112983a4353f9735 SHA-1: 647ad03549056068d2c2b039c13774e66ca67665 SHA-256: 7ebb84cfba0da7fbb69a1254ce8aa4bb6e3c897b6ed62b9c63f57bfea458713f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the overall structure and URL analysis strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://bodegoncriollo.com/userfiles/file/38749397247.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/ronuximam.pdf
    • https://topclassgardening.nl/images/file/baxiwibede.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7f4dc298b5d9cf737f43cc7450a4ad85/5446752710.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/jn9ibbk1ati5noa4fgr7ah228n/31953814318.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/galotuwafix.pdf
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/zikapelikagojo.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/d6vm4e7prbnl8ktti9b3dc1lb5/xofupivefegalejirurupudaj.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e9c12598---61186361447.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a718d0cc---46094821832.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c5d017bcc---73568973178.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8922260c---taxapipaledinako.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b738ac0a29---lajezowikenimuxuj.pdf
    • https://energooptima.hu/upload/File/95475763395.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/gufavofubanulogonosi.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/micrf46ndu2nc0gqc9r68c553d/49879406730.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608436fb43587---dadakurijagajunekozebadu.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/03v9rst71sok1734d974c9kfsd/30711947103.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/11bedj8550kiru77rkol86gv44/runupemoxenilenag.pdf
    • https://almuhja.net/ckfinder/userfiles/files/simaperewa.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ecb63c33f9255713cb82982644e7bb19/81158462745.pdf
    • http://verkaufs-akademie.com/userfiles/file/xatedojanusezuniveko.pdf
    • https://kultmotor.hu/images/files/6081714192.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=brain+out+game+48+level
    • 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_off0000ea10.bin
9e3f571b212c77770f152e2a3a69d29448b235c116484b1b0539ea5401364e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA10 16956 bytes
font_01_sfnt_off00011664.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11664 16792 bytes
font_02_sfnt_off00012e7b.bin
7640861f7ea3010769236220662a3b35693a051edbb71d99aa31e6cf800f9ebb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7B 10788 bytes