Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdc2a246d590ff1f…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 01:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8dd9120f9e856401ab7e7b534aca6866 SHA-1: 0923b3256ba9b33a70efde0c7913514e907d058d SHA-256: bdc2a246d590ff1f2b4da2c9e67cc613134d4da08a36190cbe57559b3ab9d6ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many of which point to disposable hosting or compromised WordPress sites. This suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://khiconghoixuancong.com/Khicong/admin/userfiles/file/6224417634.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a43bd27312---47806418213.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613443a7db194---44605816813.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/33838081913.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/81856159091.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/91736159910.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/20d5263b81ff71ca3b4ba21260ba93d4/63324786129.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3a453f65f---95801911229.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/39053177626.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/lamuzu.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/zevujobufudirozozojogov.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/96694605667.pdfIn PDF document text
    • http://roberthalasz.eu/uploads/file/85202419004.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/64150822249.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/fimaxaras.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/19183551357.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/20501563701.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/wisosulepakudevaleg.pdfIn PDF document text
    • http://secretinvitation.net/images/files/61737662438.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/resujaxizavedeb.pdfIn PDF document text
    • https://mihalex.by/files/files/18028935419.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391a14bd981---30929764986.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/93813438288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=khuzani+new+albumPDF link annotation
    • 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_off0000dd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD14 17732 bytes
SHA-256: f7f8dffe1f1370eee43a670dd79ebc0b0aff29d7ac318fc6edbc521d7df3d6a5
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 10264 bytes
SHA-256: 6a65107fa4b6220c7c233479a51af07a3d7d47ef44c3a373646cc8911d3bf9f9
font_02_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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