Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a45d34514905c69…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 16:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b02a0943eed9fa16a13ac3b0bf283820 SHA-1: ac3d14f464ac9786d88f44514d718023245f6c75 SHA-256: 6a45d34514905c69f02fa9bc2b49cec2eb2d97e056f075fe44f69b5d10364a3d
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The primary function appears to be facilitating access to potentially harmful content through these indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xlspandoek.nl/userfiles/file/fukonetedixuwut.pdf In PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/kasepo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d62401c04---24109345581.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/8027148757.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/kfse0eo94ipl0lmt791fcmu0hj/27312793543.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/90083623774.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161201fa4470ef---77791512501.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/wojoratubusajeweronatalo.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/83221665974.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19a83d78f---kowitiwugiduluboz.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607725de81bca---6885725800.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/8300323444.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k1tuac0fak90jnebtclimlboe2/pesufaborari.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/74226704038.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-28/20210728181746869275.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/53088703866.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/juwow.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33fb2b3a2b---viroguxox.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/vibaf.pdfIn PDF document text
    • https://vestol.bg/files/file/nalovajarewaxopifusese.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32aab51eed---58751640814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=yellow+crookneck+squash+growingPDF 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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10820 bytes
SHA-256: c3d80d2743b2861589ac48c38f2b76cae66f7457465be148f182cf8e89b184f8
font_02_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 15940 bytes
SHA-256: 195bbca5a6b523cd455680435ffe614bb05f6318d079be73375cffc70f96795f

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