Malicious PDF — malware analysis report

Static analysis result for SHA-256 0127b230a7a36ea9…

MALICIOUS

PDF

54.0 KB Created: 2021-09-02 12:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39e4b0d4f732a3c3590b6577dec71f42 SHA-1: dba8e5969dfcaa30613f970b07a7eae4ff48f0a6 SHA-256: 0127b230a7a36ea9ff755e8f3c797a56befa7642bdeea1cbbbd45557b1280b10
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the links suggests an attempt to redirect users to malicious content, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8145

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8j71dluu2shnt5b56guuaf7f1/pokaviduxolik.pdf In PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e6a1a4ae6e02d3c525db441340fa30a0/kefib.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/noxowigikasunano.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/33002458036.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/p4qefh47fno5tl3gcklgib88am/49911430380.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/jowog.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/50808824802.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da12179b02---piwuwufedifa.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/pitajitolaresez.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/74172903096.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/sufasidazeduzab.pdfIn PDF document text
    • http://hevolta.com/upload/file/98847286052.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/kejil.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4e8f4d092---8277913489.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/68253243637.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/74961260977.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/92990603850.pdfIn PDF document text
    • https://tempegaring.com/contents//files/ripinebosedenirezogugi.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/boteridesijutuso.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aefef074ed69da7ff4d0e633aff54cbf/puvovofatefikupadofeto.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/5268450735.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/190084614b6b6e6035caa149a355ad4d/fizazuvobe.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/78d05da034efaa7f6bcf2a3c7d095c13/faditowelatodidupel.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160734e71ee6d8---gifukewaf.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/17f18e7821cabe804a14e80d1fc229c8/71375693784.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=john+owen+indwelling+sin+in+believers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1