Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d51b51045721b69…

MALICIOUS

PDF

69.2 KB Created: 2021-06-30 22:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2adb636a8048e4a5c1c6293901bf9441 SHA-1: 10e56da227b28ace7fc67ba98cd927e9967ffd27 SHA-256: 9d51b51045721b69bfaa9f825107504ef8074a9b8252ae046b3fb32d455fb6c5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for SEO poisoning or phishing. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5460

Heuristics 4

  • 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://nomylo.ru/uplcv?utm_term=importance+of+dissolved+oxygen PDF link annotation
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/8nbj31cdgbjotkhg4gn9idqs8j/kusupamidafuzamovumipe.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/guwuvazibudomitakisok.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/gewozizux.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/74b48d3f699b2a40ebb43ff0340deb45/10768595812.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/mufekapo.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/muretibubiso.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tetakomizelabivele.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/visuzatolo.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b7dk3cds86q56irp9hdeb97uca/9009438369.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/a3b8358ffc01b6a819fec094cbaf0efe/pinijixawiwififez.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e91f36025ebfcf6d1f2680ce0f200f50/gesomekumutobisozi.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/da4ae16f3f757f0fd35c6a4e4ca90260/pavuratafego.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/9943608326.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/47326689742.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f31669fbd---47978205985.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/8j9v0evr5q5pmkv1tssrmlh784/jilewezavuloxibasudejetu.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0e753dc1---99536550101.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cbb7cabf8---91152966484.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/81824328892.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/18648802898.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ov9ua104bpnqm228q39522crbv/zexudarobi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ff9944a1b---buwomigapemugajuve.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607b83df9e62e---75670491628.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/67433161196.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hbca7fcvpggbus74nuoddg2qff/64556105009.pdfIn PDF document text

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