Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45487257445b592…

MALICIOUS

PDF

71.6 KB Created: 2021-09-04 22:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 799f7c19d012772fcabe306b05d6bc14 SHA-1: 6bbd27f88e227373e022dce8e1252aed1b4a10bb SHA-256: a45487257445b5926252a0ba63bbdd37d946370002998a68e9adc21e5a2f04e4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=decloaking+chamber+manual PDF link annotation
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608202e28dfbc---fikobivexe.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/35626884484.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72db67e39---didikawetufeseliwenef.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/45016778372.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fabexasirono.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d75f8e5df---jodawogexadalodena.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/99bee5ee2f35677d0369df8190e3cad2/pitizuzivovofotov.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/37167270996.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4f2a51966---69632008372.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/pugenabogogavaf.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8928060be43c33be642281190e17cd86/80941159703.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/tedafuliriwijulozalakepo.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/dazanojizeweruxij.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/rimejuwufuvopubo.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/buxumolilalutekalonoxuge.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a922045b3bb---getipaf.pdfIn PDF document text
    • http://simonide.org/userfiles/file/88917094490.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/11150055149.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/81658549302.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e7d32dafe9---77705379707.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/varazetifemuzakibezufi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1624c299eb---kojamiguwijinevupuxi.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/74216013882.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/fudidenuriwamolifaga.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_off0000b7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 15712 bytes
SHA-256: 74f9c655d63c0e3f45047eaa128afa4406b2bcb8b4e154eddc36595f54f0d85e
font_02_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 10744 bytes
SHA-256: 738d95e2ac8e339ce3acff2de6d018d5a36e5006fe69cd33cdc4bd8253f94df2

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