Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a24d4e55a2c4a7a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 03:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6d05b470f3c9d85c50e974f171edcc5 SHA-1: e848bd0059a38092b74addc5a0dc674a2e379867 SHA-256: 8a24d4e55a2c4a7a1c3ab09fec4e9186e931c23ddba92a67467183465304b4ff
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised upload storage and disposable hosting. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. The embedded URLs suggest the document is designed to redirect users to external sites, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=hooking+up+2009+full+movie+download PDF link annotation
    • http://hcstonetw.com/uploads/files/202109122229234729.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/wetemi.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/gumobuziguwogu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613487de3ada1---45080017110.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/genididudezomev.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/wupinag.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/mamotelukewixutujigaduta.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/46356394686.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/56858623691.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tigenu.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/rexojisuresonusovu.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/xixamuvopefagadusol.pdfIn PDF document text
    • https://renewone.de/files/kekovolejesukonuvat.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/878cb00de6e43e93c371463db2148a07/32752863528.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/3631828197.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/kopufenupobadefukano.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/tagif.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/jexifilupetuxexexigotixil.pdfIn PDF document text
    • https://wecareprogram.org/images/file/zibikidalijasesuzez.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/29ab31ef7f99bd69c269f5557572bfce/sonufexone.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/vuragonunalituvuwowobe.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/57471287411.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/55256748372.pdfIn PDF document text
    • 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_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 17404 bytes
SHA-256: 4c6fbccbecf73f0ec7203656b9e4e95a3cdea46a7cc6e0353bbfeb66b03dcfc5
font_02_sfnt_off000127a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A3 11220 bytes
SHA-256: 3512e77ff57ac8075e636ced1c7f9b6f8ad12d073cc2a71d3507986e68e03785

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