Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd89bb098483ea8…

MALICIOUS

PDF

71.6 KB Created: 2021-09-15 13:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 89ca0812bee59357a7a31e75e303488d SHA-1: cf50e3a5fa4e65ff0e24780542e649ca19f6dcf9 SHA-256: bcd89bb098483ea862f99e9b5076a18b604ace51614504b535130e4317658045
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised CMS upload directories. This indicates a likely phishing or malware distribution attempt, leveraging a link farm to obscure the malicious destinations. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=love+rosie+full+movie+free PDF link annotation
    • http://brmhn.com/userfiles/file/20210907055125_ljiky0.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/pupevajobibosiwanunimu.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pepirabukilov.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/didivakezonuzube.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/demogefexedituwanenurup.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/dabakat.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/93261175647.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/magugomosarobovuloberujem.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/15483679e14cf13aaaf2efba8f4ab25f/jamosebejimatovomexe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/3631317013.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/nagirevutalukosawig.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/vejatudumixegufijumovum.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/35389170640.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/gogov.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/37759647989.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2299572260.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/27c2af513c8a23f9c36bb16a1ae26af4/38692823173.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/sewijinaxokivi.pdfIn PDF document text
    • http://elitacasa.it/images/file/benajuna.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/37967380838.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef9b336868---sabovexufuv.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8471d11726d999b171e2bd55c9a56460/54631361867.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/feparuvapuritemur.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/noline.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_off0000b779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB779 10132 bytes
SHA-256: 2fb3586829c52352583fb06d5d2394595ba18c2b3a4f875d1be8a3203a63ed9e
font_01_sfnt_off0000ce20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE20 16844 bytes
SHA-256: d66ca25fb28221d97b6f20a0f7d121bf6f00c36db6f48bfa203758aa99aa3ba1
font_02_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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