Malicious PDF — malware analysis report

Static analysis result for SHA-256 d234a926b55d6b99…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 03:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7199c96d7f761a0faa7d253ae36cc932 SHA-1: b18ebc435c71427a2d51f74eda49e8c2c0f602bc SHA-256: d234a926b55d6b9907d1ee5993e955f22cabc489b14038ccb5730abf1b5d004f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://njxinbell.com/upload/files/vaserugikomebe.pdf In PDF document text
    • http://thankschicken.com/uploads/files/98308418401.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/xibovasodekuxapo.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/82502825130.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kiwuvigo.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/47415805538.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/tuvoko.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/xetorufofigoxajozofa.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/70898727927.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f273805049---gupuzafajejadafudev.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb7b0354f---62679313195.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161356c8c4971f---ruwinidorapafegatajewawas.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210911040129.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/lixezomozajo.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/43417099591.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad033caad---gifijuxijojejesegerukop.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/silelefafusunanomukus.pdfIn PDF document text
    • http://infosierra.es/images/editor/74966648988.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1ad25e35---rivijeturezanazerefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+pdf+onlinePDF 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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 11132 bytes
SHA-256: 7e2f44111daa5cea4ead8637dea030c2e869f33b5750ca1366b0b99e4f9605c2
font_01_sfnt_off0000fe25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE25 17924 bytes
SHA-256: 8be83a87fd7642d600e275ee92620b487824d1c0983e6bae59fe2dfb0dbb8021
font_02_sfnt_off00012c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1