Malicious PDF — malware analysis report

Static analysis result for SHA-256 471188aed1f8ef61…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 22:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 239a9cf4e486ffdd568153b88286025f SHA-1: a5752eb1956553d22744a1c7d388f8e9c7ed9e67 SHA-256: 471188aed1f8ef614e1db348a8f469afc47752d3f532da7d40be82de798eeedd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, hosting numerous URLs that redirect to other sites, likely for phishing or malware distribution. The presence of compromised CMS upload links and disposable hosting further supports its role in a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3de3b396---46851241989.pdf In PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/feribunaxow.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mexezufogozewudeku.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/popigiboseviwonibiporug.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/66830140640.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/kegoposex.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/69570404616.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf08315d4---mejotiximifexigiravi.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070312213680554.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/fupezexomidutedug.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sepl9b5v23paoeh26gehk0ool2/vukajeponerupitetakowude.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/53300323319.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee655fe61---70673169486.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3ea266b35a6c8b78636770282df1d5ff/jafogovosukupasumir.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/30952677545.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/bufelisefuje.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/33775097493.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba72733e16---foninuxudupuvupexas.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/5145520865.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/rolurafefifejobefisa.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/pazasovevokiroketita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=logiciel+convert+pdf+to+word+startimesPDF 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_off0000fba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA4 11072 bytes
SHA-256: 00b8731ab5896a2fe1f86695e0aa6851a17e396bd6e2a54584b0dcab210b2129
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 18952 bytes
SHA-256: d962ca0b1e40c1c0227e2d9f8625eb6feba443efb8f6965e06ceda4d388e3df3
font_02_sfnt_off00014653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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