Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0fb11314600570f…

MALICIOUS

PDF

73.7 KB Created: 2021-09-20 05:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0564861fb2db36a5b9218f79a176fba5 SHA-1: ced103b4551127beaa677f34d0c1fe49a0b9ea54 SHA-256: d0fb11314600570fc6ed4047853bf0c30b72d29cf4117e204dfd04108f83bc15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://wastran.ru/uplcv?utm_term=rk+bansal+book PDF link annotation
    • https://manhremhoangvan.com/wp-content/uploads/files/firifetifaguxexepulutumen.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/92052598645.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/rizawebadipo.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/kobobakirizom.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144154e3f3f6---32385146344.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vegisolawexawe.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/mafitewirojos.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/15846268820.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/gagapizetotofe.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/70737464700.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/votinabuzodu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xaxunisorogorowugavof.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161410d62a82d9---dudepaxusifazokab.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/45991648548.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614022f0d0dff---bogenugijesufapugonoge.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/vavomubivij.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/pagujabesimonariravifir.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/42259657029.pdfIn PDF document text
    • http://precisao.net/files/files/46138694186.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/25294908342.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613569cfbeb13---zujovigavuxupowizi.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/sozobapugikulagututo.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/72770006027.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/taduxakadigupalefazulav.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/betimimedumuko.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_off0000bf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5C 9956 bytes
SHA-256: 8347f9b7df490cd5b7ae14f5ebe637148c918e44deaf3a5c225b991f2d5eed13
font_01_sfnt_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16820 bytes
SHA-256: 97159c369c81464e73702c59cbf634685393f0a1a6051275c69b781c0a15ecbc

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