Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f420cb59a8f764…

MALICIOUS

PDF

73.5 KB Created: 2021-09-15 09:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 273a6d6026e70fc1bb74933c3efe3b33 SHA-1: 4d208970b39f0094d3d92c7340355d9be642e326 SHA-256: 66f420cb59a8f7640c1e157525b6cc9af3999565db8ab655b64ddbbe348f4d69
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. These links are likely used to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8400

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=goku+ssj+cell+saga PDF link annotation
    • https://alhurwallpaper.com/Files/files/35074709401.pdfIn PDF document text
    • https://braus.uz/images/shared/file/kajufokuginarajif.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161416a45d1422---kidobovoxeriwunofivi.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/92669552644.pdfIn PDF document text
    • https://phnews.ro/files/file/53089554529.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/fesopebimipajujazuja.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210908091546.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/gapekutose.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/rijepunuwubaxek.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/faxasukatiwaxazuforebif.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/48103709189.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/xororajanosupe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614178b4481c4---fujogag.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/vutitufesuwujemizimupov.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/jilipaxukoganosupemez.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/88496043957.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/64851404829.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/78443334297.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/58efbf52d83bd250af26a30b312931da/makixejaf.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc84e1821---wesubozuwoledudadore.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/getewapajap.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_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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