Malicious PDF — malware analysis report

Static analysis result for SHA-256 2826603caa632874…

MALICIOUS

PDF

68.7 KB Created: 2021-08-17 01:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb9a64a3dd670c1c30af548cbed6ffa4 SHA-1: 9927d8a663128bdbaef9dfaffa551d7c82f1be8d SHA-256: 2826603caa6328743e8cd1f267e733a83ae87493c35145043aa6f10f16c4e0ea
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5224

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 http://thesprotia.gr/uploads/file/39386932975.pdf In PDF document text
    • https://migger.dk/userimages/file/99582591239.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/51728953012.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/36360256748.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/jozopalabeni.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/38934547773.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/daad6252a448e5166b32da8cc1c44685/besorolifona.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/dozipazigovabutelivator.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/89429700366.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ronobaluva.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/44814692691.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/jipasapadebidepagore.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/dowumikunugovaniwalusumo.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20725323071.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/2r3tqjt0kpjbsj39341hkioe1c/dutamiritijifasuwew.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/85787772812.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56149c566a---zijaxolorefip.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/mugefuwivilow.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/dobekokusajije.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608581a88bdf6---pozaw.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/369db85102d291a6d991d6919833095c/rovezuza.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c774c493c28---57514496131.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/65210ad80eeee728f536b498d32c91e8/21628725927.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9lo3gc1jcdml01ji6leho4ak8b/kavinodom.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ma394bi1jk80t0m7b7gp3a3mf7/17823077735.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d3a4af23258ba6181b543f58c5c41a26/82821760176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=clash+of+lights+13+ios+downloadPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/c69cbae5399a687e635bf57426e6f446/forekovixubududobanipafub.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_off0000dfff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFF 17052 bytes
SHA-256: 316f71f8130b8d017d509aa2955d8e615cdf4f0dd05e3612dee58cd5555112ae