Malicious PDF — malware analysis report

Static analysis result for SHA-256 679be140c220b508…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 00:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b3d5b8204204d195e2366506f4961abb SHA-1: 1aef4b421be55c16a49dc49f63b668b14b5fc3f7 SHA-256: 679be140c220b508b6360fb9d3f75f02347a54429eb39e7fd107b2716c84d2fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://inwebjor.ru/uplcv?utm_term=types+of+valves+and+their+uses PDF link annotation
    • http://darec.sk/files/files/gofiderirewe.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/muxokatiliwixoguvus.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/8398797145.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161000997935e5---89002125233.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811fce31404---84667003742.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8514472c---45934086725.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/65799342120.pdfIn PDF document text
    • https://izr.fr/files/15647130650.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/93872916974.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3b1pvmb0ec1e9vjigg2tkl88rt/88740788731.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/letedazenixo.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lumuvonokir.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/73753783056.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611d4acac4705---sovogetixiwisel.pdfIn PDF document text
    • http://metall-press.ru/files/5019270547.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/49061267922.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7f85acc8---rolijemagopugizatabonaw.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/41475117481.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/fejofonamememixeli.pdfIn PDF document text
    • http://www.heksan.com.pl/file/44390874791.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/nomufosozuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfc9cf32e3---rajurinesixotivobewaxulu.pdfIn PDF document text
    • http://chromatographvials.com/d/files/jojarolopamozurow.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/zelipudo.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/gomeburimibonupafoginu.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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 10836 bytes
SHA-256: 43c1e72575f0b3f71d2b0d4b567676cf6c8fda9d2e7119e7f26e0432bd04126c
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 17488 bytes
SHA-256: 62e946643ce7ba66533907044969ef54aff26992d835951f6aa352e15d085be7
font_02_sfnt_off000126a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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