Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedf0fb134be2160…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 07:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ec3f95edb3a51573d9a4d5647edaf513 SHA-1: 4a8319f47af6d245c93caccfe6b0387d98d95358 SHA-256: bedf0fb134be2160b7ed5863d395439f3cd7e782592edbda226bd225341b58e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing sites or download further payloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

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://wastran.ru/uplcv?utm_term=how+to+watch+it+chapter+1+for+free PDF link annotation
    • http://j1ent.com/userfiles/file/20210916135123.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/93197880472.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/9269707372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d98cdf6aa---zevonodigageral.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/31543321511.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/78351496567.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/47533636797.pdfIn PDF document text
    • https://85097781.com/upload/files/47479047476.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/xosewolevuxitos.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/kobatopimowape.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/durigefanarepemavenedex.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/wunigim.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/38844348709.pdfIn PDF document text
    • http://feg.vn/uploads/files/98207311026.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/89451350083.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/26489908948.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/19903533207.pdfIn PDF document text
    • http://nwhouse.ru/uploads/file/49430731978.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-04/images/files/59046486446.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316978b237a---gibadufafaxakujerixazu.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gakituxizuforonopo.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/55367846421.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327462e5e14---23880685235.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/mazeregidagavejupo.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_off0000c03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 17160 bytes
SHA-256: cd065f00cfc20080fd5fe65d3c0c58ae725a65c0d2a8e23fea2c364a695c03dd
font_02_sfnt_off000104a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 10388 bytes
SHA-256: 78f8e4127562a87ff7dd7f99115dbd74f9c0cc573eb0a08867bb09242c7efc40