Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75afd39ea2f1b20…

MALICIOUS

PDF

54.6 KB Created: 2021-09-18 23:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2d399aa07165a8244dd1fa009c35e07 SHA-1: 4ce8319ba8ab631bea9cd4e2a96c382bb9e045e9 SHA-256: e75afd39ea2f1b201346d13fd48893e0a1586ffb402cf0b5f08835c74f05aa8d
154 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8323

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130dd39c6346---60336673643.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132655c914b1---37697981000.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/tewaxobupumixepatipog.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/jisexalagapepoboretegi.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/68987604601.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/libozewenoxepogesiz.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/jewodox.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/81702465806.pdfIn PDF document text
    • http://hocomesun.com/upload/27862324639.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guzinededupoguwofu.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ac13a00b25afc9da11d23d0737222a6c/jelogoxeladakugaw.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6eebd60---gubowe.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/sixatipoto.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/luparopogugarufalusefipe.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/datize.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/1307170222.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/zisijanuwolawifivarizumu.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/dovajuzelowuzekap.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/11666688559.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/82520930295.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1631439981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=where+is+the+dialer+on+my+phonePDF 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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 15364 bytes
SHA-256: ec9b2ee109933cc421bf46567ebbe07f34344885fbb69d1c3ac570c5bbc6f508

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