Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc40d5539a6aecdf…

MALICIOUS

PDF

63.7 KB Created: 2021-08-28 12:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25916f16060886747017be46ee47b02b SHA-1: 9458947ea6199ba5606a8c18b833e5ea2887bc1f SHA-256: bc40d5539a6aecdfbd5cef94ad5b4339472c00b94754e86e1a701765ec921d47
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely serves to redirect the user to one of the listed URLs, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7169

Heuristics 6

  • 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
  • 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://crysiq.ru/uplcv?utm_term=contest+in+court PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f08a9c978---53535144298.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/15766329449.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/69362573735.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f36893c0dd---sodaxomakido.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/nogifopefurila.pdfIn PDF document text
    • http://primaneighbors.com/userimages/vezusupafikiloz.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/jupukola.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/g349nta5qn5955v3sijjr557fe/sidajuxi.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210827101432.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/35485300939.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/72074637065.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/beogiplejh2ruvnq9h34rb6blp/rekojavoso.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/q5159jt0b2gj2kr0fig5ak0lpd/52112468882.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107080110090617067ymxbu.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161100ff5488cb---11701542428.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/3579977996.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f917dcc228---99924127237.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/20379879908.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/wefozatakusofugov.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/16836167547.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/77358325882.pdfIn PDF document text
    • http://wenxuezj.com/images/File/fitenofuruluvofafilezed.pdfIn PDF document text
    • http://effektfilm.de/files/file/540150989.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/71547670585.pdfIn PDF document text
    • http://axwelindia.com/uploads/navadewatupekitaguse.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160735b133d379---30377349260.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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