Malicious PDF — malware analysis report

Static analysis result for SHA-256 5332df1cc8ebca3b…

MALICIOUS

PDF

69.5 KB Created: 2021-09-17 23:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 592ec708c56ec3f4a8b74ff325e54787 SHA-1: 6ecaa4ccf3e33053d720defd8dadc424950ba789 SHA-256: 5332df1cc8ebca3b29994a37f4abcf70622ea62cada81027e800c9de48a4dcfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=one+amino+acid+that+has+one+codon PDF link annotation
    • https://rusepress.com/uploads/wysiwyg/files/xagamu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3d681b7e27aefe9dad2cf91382acc80/juwukepaxorimovara.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899b1766c---miwufejuxezikogu.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/54466842815.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/75522028107.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f9be79e60c61aa82a4849d08c72e9a47/rugotifidelokuvuzemedezap.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/57330721553.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/97670703325.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/38530737950.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/dofezefidekokogul.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/piderureku.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/pufujowejuviramedaweru.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/61302768168.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/k9fabk1823m84m4s7rg47ios27/35365363596.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/5879547966.pdfIn PDF document text
    • http://potya.com/waxiraloziwetopuzibasa.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/29217318084.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/dunegoroxuzirajufuzo.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/zuwexo.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/jojoxaliweju.pdfIn PDF document text
    • http://school15-tyumen.ru/f/50837202525.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138c59901688---67671944964.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010886af42---sopufagijolerinosomebeja.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/76447943842.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_off0000b342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB342 15168 bytes
SHA-256: dc26291cd100dcff3d9eeb94b90863342f7a072d41372fa874060f19f9a180cd
font_01_sfnt_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 10516 bytes
SHA-256: 142be5a09ddc906fd026ce2d6e8bf7e00757f5e9ec8efe44c939e5dbcf459c13

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