Malicious PDF — malware analysis report

Static analysis result for SHA-256 79bed47d13c0f53f…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 21:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 34a724af0ebba720fc3daf2cda6686d8 SHA-1: e001aed6c32641722617964041717f525e1b017c SHA-256: 79bed47d13c0f53f86311d6a1ca2508f4dd7e24f7dcb07a265b452c72e34218f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=convert+video+to+audio+only PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f15d4bbd568dafb59410a2fdc6b7cace/meris.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/xuwoxodeg.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109270637495225.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154291841627---dakukukojigojiziwogimep.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/sevipi.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/44236920278.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/namiwinurolo.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/modape.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/43107589344.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/13551018695.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/10327651766.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f0d250f6---jixaza.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/bepexebit.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5t4qjss313snqvoesvoobhiplg/zukanamipimonese.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/wonapabegoranisojaw.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/79377192806.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fh43f9pc4ig24ptp36q24al9ve/81639251527.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613300e8e6b30---77662966204.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kufajedetexuda.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/bowiwukorojuxone.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/81051325647.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/xojito.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/mekebovij.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/topiponitokefa.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/17e8f46a6e07e7e564adb5b57715942b/18374291989.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/a0a74b8af816e4c68efb3b27723ffa8d/880211584.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_off0000b572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB572 10384 bytes
SHA-256: 96df754bfd194e160e05dae5542beb8a4f574dbbff4974971cacd03f200d4cbb
font_01_sfnt_off0000cd12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD12 14956 bytes
SHA-256: 909bfef6c92df600e746b668946ec0248bcebd58c61c01e1abdd4f6cd7451bc8
font_02_sfnt_off0000f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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