Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1dbccf5c0efd2f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 02:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36a3a61c1a43c0d4e4f2cbc394b77c53 SHA-1: c1530c157772149ca86e08804996ee7c99243a13 SHA-256: 7b1dbccf5c0efd2fcfbd558f7cd54264732bbf545547649fdc984a76f523e77b
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress uploads and disposable hosting further indicates a malicious intent, likely for phishing or malware delivery. The ClamAV detection and ML classifier strongly support its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=pericardial+effusion+after+cabg PDF link annotation
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/74020135160.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/06046b54ea2f41606f8ddd278d342420/juxalokubebumewaxufesox.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/rozunopu.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/72969695586.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/64253251268.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef327b7748---37372325641.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/9280095319.pdfIn PDF document text
    • https://heyratacademy.ir/file/rowogokinu.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f21fb078eb15774db48ca59dd56dd883/zaxifovatizamofamomameri.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/sovuranona.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/wulesakutizezu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e14525bd9eb90bc8d860b505fe6859df/59896523677.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/8g0hld6hf695odkejilh2mp6no/taninazaxikunalivodegikul.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/37100a3e0c3e263d48af912e0428dd4c/77798262154.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/93206481240.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/ditelexozerug.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/29406586060.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610993dc57e6d---radowibuza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1524f3135c---nujasajusugatixegetovet.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addd079b25a---geluratoperojegazit.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9afa2c8f---lebuxe.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a9edf02f0747ae10855d218ce10f42ab/nasowelosegexukovep.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4g19qvmrmkit8pcgrp5h8u07oj/bowisajejalefawejapokiwu.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2df1c9341---83780756690.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/getarodabadezixe.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_off0000bed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED7 10892 bytes
SHA-256: fc6f6160c9604b15097ff0cb7c7bc3cdcd6132c380e24a0af2eee91caacb4f63
font_01_sfnt_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 15112 bytes
SHA-256: 774e842b81cb4de64ed4893f844c897f94b1d472551ac5a8072054b85a800b74
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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