Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef45da43f0174589…

MALICIOUS

PDF

80.0 KB Created: 2021-06-28 08:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 22e7ccb513b7cfe6e123836aa28b92ff SHA-1: 1c53ddb302b5ae52ee0716c6f589ea790146af83 SHA-256: ef45da43f0174589c21eb04093da30085bcd798ad6ba34c9262dbcc26e44e1e2
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a business-email-compromise pattern, likely aiming to trick users into making fraudulent payments or revealing sensitive financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://oniceh.ru/uplcv?utm_term=can+you+transfer+cash+app+money+to+your+bank+account PDF link annotation
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d45403f4---xowesojewerinatu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/8275cdc3837dccabb8a336afa085699e/palebelem.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7a3b9804f---juvuridumed.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/88622754242.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad759208e---lupusilorajulavozumuvunu.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/99055818145.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b497878160a---farituxuwog.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdfecd6bd0---lexuk.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/55940293274.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c97b8033fff83998b5678865259ad8d0/luxusapofizala.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/6794281278.pdfIn PDF document text
    • http://erex.hu/upload/file/94516440348.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/96047054971.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098296f680c3---74924055407.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/57932124133.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/dovujonotulomotop.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a24f1d7b995---kezikovowinugubudewasupan.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc4150a25---37496089439.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/4feb4730c343255c5768ddb2d794eff3/59080013454.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8db50dbb476a009fdc8c079db573fdb2/xutevarev.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/531b7fd3aab53ef24d6bf3a6d0c7067d/pisupomusitin.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/bawil.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/kekurumov.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 16348 bytes
SHA-256: cf21cdc6fe51da95b0d74c3c0f641be5046e0dbf0eea93f6656a77c859ba0933
font_01_sfnt_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 11084 bytes
SHA-256: 09e2fc25f1b1445148e5a99b7e96bd048fda03702561e69bc6e84eb015167f7f
font_02_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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