Malicious PDF — malware analysis report

Static analysis result for SHA-256 72688998e1474f78…

MALICIOUS

PDF

44.5 KB Created: 2021-09-03 23:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad7745acb767258609a9e7c04256b45f SHA-1: ef3d2f07c07289b103f78d833911a25ffb819b20 SHA-256: 72688998e1474f7885aa31781bbcf1942398b2d499d90a7afc7d32767d9a66c0
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond being a carrier for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6809

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://elskup.pl/images/assets/file/30715737012.pdf In PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/34790584496.pdfIn PDF document text
    • http://dakmet.pl/upload/kerejodesimiwop.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d02960349---59826526247.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a3aea9aa---kivozusaxifiker.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/42656274724.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/ninepudepumilezibez.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/r5a6ihoiqmi2apshj9fsehqb04/1259977709.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac45b3ee0b---nejivuneludiregitufedo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/17au3ggqq11u1mbt8m13h461j0/31257041830.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608172a95e203---jemerutaxibo.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/31219645527.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/18564850720.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12a470933---1234789328.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067f4bd8e6---25253376214.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/78926957806.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/3np1i9o7jkc4c2g529ur0rorq4/lanimeturuxumuliwinuvubuj.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/58680360671.pdfIn PDF document text
    • http://scpt.it/userfiles/files/temufenijizodebodix.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/25639113658.pdfIn PDF document text
    • http://tcihk.com/userfiles/renemosugorinune.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/relofurunosigovitud.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2a014449---10692830322.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/melolunifozitutijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lions+club+international+logo+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/3983816362.pdfIn PDF document text

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