Malicious PDF — malware analysis report

Static analysis result for SHA-256 04e6f4ebff99c767…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 18:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 45206e4e857223666c8ffeaecc65f5a9 SHA-1: bcd3bb0fd12119aa2d9389da2b40417816f25ac7 SHA-256: 04e6f4ebff99c767d07c37c63767c136897601982d46e120c822864f8bcd69b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://daonshop.com/files/fckeditor/file/lelevevuvadupadufav.pdf In PDF document text
    • https://webmenuplus.com/images/file/94274436918.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/guzufuvejedox.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/86129418455.pdfIn PDF document text
    • https://wsbtitan.com/images/file/livutejemuruzasideganobo.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/5244406809.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/41902491175.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/gukusinarelubipo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/wigegavujumakizejosir.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/emsm3ebksnbgbibiflsus86s46/27252968400.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/84090787884.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/98154243295.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9123435d5c---nares.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095aca343605---7550812427.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f68b514e3eb---41603177407.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/18222852069.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767811774bf---51563152072.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/xevosobixavodinat.pdfIn PDF document text
    • http://rsst77.ru/upload/files/wepanixowiwojosaloneb.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607da24cbd669---89302091274.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/pifanebapik.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d631e553f1f---99048896649.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f1tmon8r5voi4cui6c3atgk0f5/xilapemaledone.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/87959861937.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/9amoc5qopcrj5smcv84k3fdael/lelefujivajedupoxot.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/mitozedasilosasufex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=khassida+pdf+englishPDF 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_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 10452 bytes
SHA-256: fb2036e2ae5c16e40caf9e6413230c4e466bba6b571b8ce7463c024315c7c0d3
font_02_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 17260 bytes
SHA-256: 6de8e40d41d4c995a85dbfd59546afc82ed6f7390436aef6822ab7e4bff5330e

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