Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7c5b9c57b09c6e…

MALICIOUS

PDF

140.2 KB Created: 2021-06-17 14:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 267175b74bddac7adbb0dcc99e59b2ab SHA-1: d59fa69d512eae32a76cbedbf5faaf61330baf8c SHA-256: 7a7c5b9c57b09c6e7a2e12987a973ab5ff20a22d1b95c8eb37ec32cbccd0cafc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, and one specifically lures users with 'toomics vip account free 2021'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=toomics+vip+account+free+2021 PDF link annotation
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ejtkf6qtqg83ac1fk5bkpp3oj5/39095816465.pdfIn PDF document text
    • https://autopratichesas.it/file/dudebebumifefu.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ebba5ba8---dojobetogefigonad.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d1f62b8c081b0941250c4d54813fbfed/69449391797.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/21423486266.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/037b98966980021ecfea64045ee1de41/63955032651.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7497799752---87006175564.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/fodadimakunadero.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6cc4b963a---98173736792.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kvvbt286ar7431dho3ofn95sr1/4283425868.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/pixamolufilafur.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57e0e41a67---napiredozolu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/54f2feef01b67486219170a78a23f0d0/jumiriz.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gewozuta.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b24684670---dutunurubutuzazotu.pdfIn PDF document text
    • https://giustofiori.it/file/40432525233.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8f709b35b4417268c52a5162267715d4/gorufokumudujovu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001460d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 52444 bytes
SHA-256: d016bb234bcb4fc005924d6f5271f435eca7bb216050f07374b7ae0c29259895
font_01_sfnt_off0001e391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E391 5464 bytes
SHA-256: ef3900597ce794c6df06bab001710e5d83e97828d162d0c2a313edf75f9f5baa
font_02_sfnt_off0001f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F61D 13504 bytes
SHA-256: 605591b99b86396486271fae17e916407d5da8353b28d2d1b966c13d96c4c3bc