Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec1a5897cb52e6f3…

MALICIOUS

PDF

92.9 KB Created: 2021-06-27 11:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f75c9b7d2468ee7c8e44492865ef22d1 SHA-1: 15982efc9c1cfe9e2e5bbce3e0b118fde6b0ec3c SHA-256: ec1a5897cb52e6f378df7d847b8bb46cc953557e9229aa61eaf559cde066fba4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, and it functions as a link farm. The heuristics indicate that the PDF contains numerous external URIs and points to compromised WordPress upload storage, suggesting it is used to distribute malicious content or lead users to phishing sites. No scripts were extracted, but the PDF structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6368

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://nomylo.ru/uplcv?utm_term=backup+disaster+recovery PDF link annotation
    • http://eperon-kochersberg.com/img_db/21483208754.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6bb3b1c1b---zawufun.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/p5qe0locforsaga3fcar6l71vc/90724308263.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a7aef24937f627fbfffd6b63d5ced971/kojudirixiviwi.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ebaa26f64---sukiwakejuruk.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e53af5aaf3---94189616331.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad859b72c76---86922598879.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc10f7494a---63883898283.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec61d0753---xofitimetidor.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/gidibusewir.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/kabuduximobebukotudov.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/65172bd232d449a152325c3559cbb660/luvakukanopalaramutokuguj.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/deed9c1487cb4d0fca33fce76d62428b/xefawej.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/r69bp93a6dec1eh8rd7l0jm813/8830617406.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/78260907926.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2159a894---70426975819.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b390cf796---sunobixetesagozis.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a554b9b6a---rivonaxoxom.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/d1bc756a68aca9bf7a0272b641344455/liseroliwefu.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576cb6ae26---78000341452.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/giguxowibizapub.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/19454521168.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/06a37e4fa63a79a507e231fd69e4b3ff/xoxon.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a30617846d6---vuresujorajosawenu.pdfIn PDF document text
    • 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_off00013383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 17480 bytes
SHA-256: 51171c06203a17af05e8d0e8391c52bfe60a33ca4357843929e814648eecb4aa