Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac87b6d2491612c…

MALICIOUS

PDF

48.3 KB Created: 2021-09-25 17:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9ee2018c9e8d337eade51038d75b1fbc SHA-1: b77f6be1fc084908f8c12972b6180bd4d7931010 SHA-256: bac87b6d2491612ced50850b8fb9f7b41036b2e900572d0c847cf55c1c6fb74b
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5830

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://101-games.ru/images/uploads/files/wekotodarisuvovomiwamol.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fba54b111---kipopibumejotenod.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/wivonomunederagonak.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/pejajalorividet.pdfIn PDF document text
    • http://remobudostol.pl/pliki/bujelotewuzuwop.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/13072346246.pdfIn PDF document text
    • http://www.bash.cl/media/file/66788785398.pdfIn PDF document text
    • https://servicio-mexico.com/images/file/vizanuzujike.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/lovabofazi.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/91487084897.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/60954988514.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/zabidawemorol.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/gekizimafenuvuxepe.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/23676064304.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385c66c98d2---lesazagazi.pdfIn PDF document text
    • http://thuannam.com/image/files/84265619064.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/3999449130.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/xonezaxidesoretux.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/muvubuxopito.pdfIn PDF document text
    • https://newfrio.com/userfiles/files/gapexe.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614b06778cbba---wunawuxabozixoxemugowofa.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/66503224361.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/81328805318.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/cde3c8712eafef5a568ad4d97f39092b/15725140327.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/zirefojetekovetujewe.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bb948629---32874315727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=dream+house+putlockerPDF link annotation

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