Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7acd6dbe2580d73…

MALICIOUS

PDF

70.9 KB Created: 2021-08-04 03:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8af7121ac3e6d7c6e11c17a6bd1cc719 SHA-1: d6f61ff595aa4956eb4860e52d2e8f85f86da187 SHA-256: b7acd6dbe2580d73a0e7592b62a73daba5fc1fb4447b7ed5c9f2769372f179b7
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and heuristic firings indicate a malicious link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8748

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://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e4nbfeno2h2158p41e9cic671l/80873286831.pdf In PDF document text
    • http://www.hangmandigital.com/files/file/16516502840.pdfIn PDF document text
    • http://toonesk.com/upload/gemisirupepadevomusa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52af46b732---12198697193.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2ebcb6e8e---32449549767.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/849ca5a410cd923e691c84b01406fa6d/fikiwisuminatekugipib.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n37lo58dmbsaiqjvo94o3cdmh4/70681061482.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc04a3476---80817480688.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/50527332995.pdfIn PDF document text
    • http://ccsl.asia/files/saxirapakigozefofi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c26f47dd7a2---49074903566.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a49a645dcdc---37532353772.pdfIn PDF document text
    • http://greenld.com/userfiles/sizevumover.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3vhdmk40bdkfrdum868jp41com/zekikuvulosimazupirekuzup.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b8892fe---22773311470.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/66590733750.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/kegub.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hjig7lkjkm1cudo6kbaflmqdcr/dabokowaxebufatogezer.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/69085900477.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d68de8ab0---kazakumufikezareg.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/gikozo.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/widokufulidaz.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec046c586---sorobenolewezugurejes.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1346dcfcba7bf5acc6267a7266f77593/tebekup.pdfIn PDF document text
    • http://mesterek.net/tmp/kaguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=5+whys+analysis+pdfPDF link annotation

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