Malicious PDF — malware analysis report

Static analysis result for SHA-256 f973bfc8386a440b…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9db420b25026e6fa43189166f78b4356 SHA-1: 0d4d32f25f3f84c9f77a4ec505ddce9d37235e50 SHA-256: f973bfc8386a440b02cc59e44e0ac8bb1f4a3cd22b0b1d61e88c9ce8d1b49605
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of URLs, many hosted on compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or redirect users to malicious content. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=castor+bean+farming+in+zimbabwe+pdf PDF link annotation
    • http://scro.ru/pic/file/642314793.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/073ca6ef152dc4a5fa083203aff05ba5/majoj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/531ba99b22d4f6196ee178168385f4f3/zebidavevep.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bd401aa35f745805706021ae8cdb72de/repaligaxirajerovixojusi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/fe3ed5a9072a6e055bd72b4d9d3051a4/71073190974.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/bilim.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd019d2c2e---jexiri.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/mlon2jrv3c6lordo111634sj7o/35463594693.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/fipuravowubefa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/44460bd736a1ec9700e724ee2b7a6b10/wutexozeduz.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae20d685043---51268460134.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/28488892745.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210830070357.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b8ee848cb---gizef.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b81c637900b33db18d253e9dc1c6d41/87323969159.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/45399533452.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/33054754654.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/63c9dd314b15841f2ef5e9d12c5c3d20/lugebanaxizuweneva.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/fiwivejaxe.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/losesobusomimol.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/6a665bbe78588918fa1ad1426688244e/mironutirokalujip.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bba0f109930---92420255165.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/motiran.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080317b2efd8---36814544897.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/femila.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 11112 bytes
SHA-256: 665c24bdc96049a57f0ce1ef8444fcc4191873db3a3abf173ada78dee3ad878e
font_02_sfnt_off00012183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12183 17648 bytes
SHA-256: 8046148349585c99561b0955b21e4fa17caacf78c01f0b80ddd9d0611b557848

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