Malicious PDF — malware analysis report

Static analysis result for SHA-256 45878b212612727d…

MALICIOUS

PDF

128.7 KB Created: 2021-09-19 01:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c13c6c8ff5910e7f118bd4c937ebaabf SHA-1: bc55bcdec0f7e4fa1e1e7f309c43fb710cb08254 SHA-256: 45878b212612727d0677b9a7d5ccd1b4c22fa81a55fc7d34b4ba0cbe008c4b9e
154 Risk Score

Malware Insights

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

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Numerous heuristics indicate the PDF contains a link farm pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=borderline+paranoid+schizophrenia', are suspicious and contribute to the phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8725

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 https://smidgel.ru/uplcv?utm_term=borderline+paranoid+schizophrenia PDF link annotation
    • http://gjbbang.com/userData/board/file/mezelegobutiromulujagoza.pdfIn PDF document text
    • http://njchemland.com/upload/files/doxujusuzolaxeposiv.pdfIn PDF document text
    • https://esvigo.com/upload/files/lawozar.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jegozuxudalusominazokap.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d0ced6385---36355515538.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/puzarulasetetameket.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/nojowokawojuwake.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/tupuvolirapelani.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/t5ahrjlr7qjgbjv0ved8k5uk5k/21828745661.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/vezewufebubapikubomozilud.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/3767770112.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613401ac686b7---1476544279.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16146210eac77c---neseduvusuvapukaguxev.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jm1o5kefl71qvs0qjrv1s9o1p4/tetowodasoj.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/63950781478.pdfIn PDF document text
    • http://signauction.net/userfiles/file/falenuxewini.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/90030922717.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/zafijaju.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jowesivovebejilijuj.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/bemarasijusi.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/90259687588.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jp97jdv54s4v1tnm8h10c3u7r3/bizibuzediluvu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0ddad1b3977eb7593532d8c4c9a3d953/40937788078.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/50323295049.pdfIn PDF document text

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