Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f35dc1dff1bccb…

MALICIOUS

PDF

90.3 KB Created: 2021-06-28 15:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d90721e965ce6b5bd3d52505865fc38f SHA-1: a42c6805ec7bd62c85b4ef681f9d209c3fc3d233 SHA-256: 33f35dc1dff1bccbfceb2a340e29d39f86fa517f8306d7151b756784b8623590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=diabetic+blisters+on+toes
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb75a21790---tatotinigege.pdf
    • http://www.prieteniitehnicii.ro/documente/file/zimilowolanuxivizuzikilam.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f06ddcf78---lobinimeferafiguja.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zuferu.pdf
    • http://mispuntossaga.com/campannas/file/49408072622.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c27cbf8e018---83303261261.pdf
    • http://altadirezione-consulting.it/userfiles/files/23822885917.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/85ddef9c92e2f11c3660ae6b9b763224/46889226789.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/dcf53c6bc7eba3ffa68e2090afe16c3a/36465061106.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd8bf20ef---fatekopav.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/a51e016ebf709a755ebbd9fb5f34870a/21364407605.pdf
    • https://led7.ru/file/lirosokewineba.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/39d45e4d04f04b9e064b6909926660a8/81566709374.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/78890f46e36ab109fbb25e774fc3da80/debebiw.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d35840c96a---85600140319.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f479f7bde5---fevuxup.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5ca569e9---vuvugafuzewo.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f6c44f91---xitoxamaboxage.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086637ebe80c---pugunazixafav.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bd337720b0e7523db82984c98972ce13/40118960176.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083859da8a55---47830861830.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609280ae70b19---4415101300.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a82efp2u7b204lj3ar43892v75/xalesavexivolabevonus.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210522073302163.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff28.bin
3db5451245ed5697a7339cf5ec6430ffede52edf8e7d912e5d6b564cd2f28a9d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 10364 bytes
font_01_sfnt_off000116b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 16792 bytes
font_02_sfnt_off00012ec6.bin
4210b0e6e06062135c94ad51cc631474bd59ce23367fca51126a068116bad08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC6 17044 bytes

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