Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db0f1405eb4e023…

MALICIOUS

PDF

77.6 KB Created: 2021-07-25 06:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5dbb16a38db4ba095d587ed280b8766c SHA-1: cb744bbc0b88dbd586b507ada8fcff42bf371ceb SHA-256: 4db0f1405eb4e023eab5126661651b8c8b33dfbd7c3cee0bbca775d2037c89a7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to these external links, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 6

  • 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
  • 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 http://ipublicity.cz/data/file/pepogudevotika.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aefcab77---26741363964.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/putofag.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c0a1010c9---biradafofisolitejimati.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6c4e8d78cefc1a3804b6e6e30e3bbac8/15410863443.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/bifijixowo.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3401083e6fc0fee9cd1d1b8bb0534cd8/78433355791.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/94182798548.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094911f6a155---puvivilavavubukezinetu.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db78538e96---24767443876.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/wiwudo.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/narofukijevebetabuvotenus.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/adf21af6a85cb70ab903012a268a4e2a/39612432279.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c2bea4e1e---80186272480.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ab0d5bd04---26052782907.pdfIn PDF document text
    • https://digireg.nu/upload/dowesakegojokisadenu.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/61864429766.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gabigela.pdfIn PDF document text
    • http://ave-france.com/pics/files/73989349704.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/r01v95rbniciupjtnsvfmef9du/xaropalasewafu.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/47865843440.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/jelaki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=clan+7+con+hola+amigos+1+%C4%87wiczenia+pdfPDF link annotation
    • 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_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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