Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3a6c12e689e374…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 10:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e73798184f66d2714cea5b7f0aded2d SHA-1: a4433529b7fc322f2043c5016fc7fa0998940251 SHA-256: 0c3a6c12e689e374df0c04c10069af7aad9d84c1152b6f9967714e9033b55cb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect the user to phishing sites or download further malicious content. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=www+free+indian+movies+online PDF link annotation
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141128c24a5a---1534844031.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/goduzamuzuv.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/vuwemuzisofukipofodinu.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efb6fdeb0b---48833609669.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/riwar.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/botakubuzidu.pdfIn PDF document text
    • http://master-br.ru/img/file/56441763330.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/37696342988.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ea3ad7b6419df5eed6af61a2b706e2bd/8982929080.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/62151468589.pdfIn PDF document text
    • https://tavio.ru/files/file/34471094387.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/wesafadir.pdfIn PDF document text
    • http://futboltotal.net/images/files/84284514320.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/xadebutatifokorisi.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/fifijufolawikiti.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161333fe414d17---26377330651.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/19014729405.pdfIn PDF document text
    • https://lorus.rs/files/88756144546.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/86395559979.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/28325613477.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/50599206857.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/wubono.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc1420d2c6---kemudepowurekogebaze.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/1266150430.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/35363881337.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_off0000d6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F7 10564 bytes
SHA-256: 65cf4ed5d6df547ac628aa8b9e3e10147fd7e4998341cef752642255a1559d95
font_01_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17188 bytes
SHA-256: 5111819073c8ccf34e20b34ea9b3e0f4b240576c77110764dcfb1b5d062600ce
font_02_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1