Malicious PDF — malware analysis report

Static analysis result for SHA-256 4044d2e75b902095…

MALICIOUS

PDF

54.0 KB Created: 2021-08-01 08:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8cd623b65e4a414404a0b73908ae38c0 SHA-1: 4819d9480a60991e6172a31752ea6adf81c80b66 SHA-256: 4044d2e75b902095f586d25354e6a8a6dcca614d9962f42edf510e813c2961b1
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which are associated with compromised CMS uploads. The PDF's structure and the presence of numerous external links suggest an attempt to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5782

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 https://pistant.ru/uplcv?utm_term=topologias+de+red+hibrida+ventajas+y+desventajas PDF link annotation
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/bba5c09d7da1b184054886379703f5ae/govawegogafasatedede.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/giwamafevumotu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64c2a8eeb---7574599417.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/moliwuxaruban.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/5910060810.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/gokebaj.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa34037325---76168913076.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/pinojavogele.pdfIn PDF document text
    • https://ka-base.no/images_content/file/divetef.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9b90a86f---kojenek.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/galogafixegogalapavaloxe.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/44671122629.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1251e7e6c14d40166fbe0887824f7c7a/24462898110.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/46400357383.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd16073a71---zunuzisokuzidaterelixa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609834ae77beb---59710108608.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609758bf878e8---digikenijekutiwuwoxugujew.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/56710575928.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/59708287305.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e891f799d01---74347843746.pdfIn PDF document text

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