Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8ca1a5b45af8d5…

MALICIOUS

PDF

78.0 KB Created: 2021-06-06 17:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d8801c25061efda3e7eaa93b96d70f35 SHA-1: 6d0c3d53472f6a1fee9c501c7b5de0f214216154 SHA-256: 3f8ca1a5b45af8d50b1c643b0e22c87cc290a0678c1e70428853de269a0648f8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other domains. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=where+is+the+fuse+on+an+amana+dryer PDF link annotation
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/0e03e73cb2ea2ef28c33808a830848e7/75524271242.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/62213420469.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089e7ea7a05d---xazebami.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885ec5cfa4---91963337747.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/79ef6f0d15d339651a1198f582a09420/mogiruletozegon.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2f9db2805b919c2d61869fac50b26d30/lizafad.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/56961700630.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8fe8bdc1---wavuxowekimugenetu.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/26973356228.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160784131b587e---vutefata.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/nefokijobivimorefokuwaner.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e69343a17a---21359770185.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/8693651085.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3773a6c08---86712240568.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/zamosujosusupiwosamewide.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/lekadivubenatixugiw.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file/%5C/bifofikufeketaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 5112 bytes
SHA-256: 0b686714306d9900ec886afbd330bf463e36986e3f920ac3ec6b9a4f502a8f29
font_01_sfnt_off0000f7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C5 10868 bytes
SHA-256: edd9fbbede0a809704e486ed56365a0cad66815da9aa8f3e24f677c423005863
font_02_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34