Malicious PDF — malware analysis report

Static analysis result for SHA-256 661b252def849da7…

MALICIOUS

PDF

72.3 KB Created: 2021-10-17 13:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: df6414f47ef33c93c02a139ea2e0926d SHA-1: d39663fd5b12976502601d9c6d5e6d457532260a SHA-256: 661b252def849da7156c54335a78830e2d38c2bf04769849ef8890371edb0f2f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Pdf.Phishing.Trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to potentially compromised websites. One prominent URL, hosted on 'aliancegroup.su' within a WordPress plugin's upload directory, suggests a technique of leveraging vulnerable CMS installations for hosting malicious content. The PDF's structure and the presence of multiple external links indicate an attempt to lure users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3566

Heuristics 5

  • 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.
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1615d662a7d48d---gadebovavumigavore.pdf In PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/50758325682.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/46687159781.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20211016194444444.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/47813960547.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/kixijute.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/17180430754.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/nt7tfsd8dhiopi7oh7csvd57d1/xalugugixasejafena.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/kewuf.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/8124866861.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/vomozidirowujigudijuzed.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/55367846421.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615322bdcee56---salusexikaparu.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130a5970120a---24666217552.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/ramej.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/84025581455.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/6204650414.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/89876672498.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/92049187611.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/17364075102.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/gukipifatuluwu.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/72080690914.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/nosiwikibakuximata.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/6Zflnl449io/uplcv?utm_term=what+to+use+with+you+was+or+werePDF link annotation

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