Malicious PDF — malware analysis report

Static analysis result for SHA-256 1161983616db8d32…

MALICIOUS

PDF

61.0 KB Created: 2021-09-03 09:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f97ef3ad9e5d4f0617eee9ddb97a2e9 SHA-1: 082eb31c16e05654d9f0fa919c91a5cd5c7f2de2 SHA-256: 1161983616db8d32d87607866d550f419fa63b153881121e28263515e079d029
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5269

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://chcial.ru/uplcv?utm_term=groundwater+hydrology+dk+todd+pdf PDF link annotation
    • http://humanitool.ru/userfiles/file/12899480000.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/71485090779.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/70941660178.pdfIn PDF document text
    • http://zubrcup.by/files/files/xogevabofutera.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f34f8e228---15234340943.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/namoluvob.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/aebad9b18bc306cefa18483f4c928b1f/dusunagufupevarosari.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/463236726.pdfIn PDF document text
    • https://codecs.roimages/file/taxamizudisanotojafaveve.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/45244904594.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a119e58f---35417281795.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8vo3ucrl5qenetuo4t4lbsqrru/pugevobafex.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/jokexefetazawa.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b76a03dd5a0---62058187252.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3217adf8---sixosuxijuvavopizese.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/tizazurigilejobisija.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/30338332360.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/18858228193.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/23948408779.pdfIn PDF document text
    • https://motecx.com/images/file/318794794.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/xidawif.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/10222927556.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/45040358879.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Open this report in the interactive analyzer, or submit your own file for analysis.