Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc448c5f2a92a8d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 13:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16265dafd94e48fccad999a1cde0b22e SHA-1: 075d18d7f6e32e654c412375a02c7af84f585b0d SHA-256: 5cc448c5f2a92a8dcd2b58b1931d47baa21fa7b4bd6ec7c942326e2b6d65a35a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings and URL analysis point to a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://serdceprirody.ru/userfiles/file/mowubefuwetijul.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e7534f51---nenoleli.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cb75a73acd0d8b351964696a56d1e130/tiwuko.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/50097079829.pdfIn PDF document text
    • https://viceda.com/userfiles/file/jopodaseburodutuzeva.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/48180684563.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4n97ku30ob290dudp7ung526h6/29610207134.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f8c364ba80d03d6efe72a7e9feda06b0/budipiw.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/34412791156.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609975056c498---99101856231.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/dubabijesujirivuw.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a75537bf5206e31ce86618306ae0e8b5/23158028685.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bb9mgtjkpeotr811c49bplm2tl/pogobozolire.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5297690f3---lutebededowa.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/takapovovanilo.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/rilokuxotopivepusukoso.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46bede2eef22ab1d86b890cc6840cec8/97377669313.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fad1561208---kojigakogamunipa.pdfIn PDF document text
    • http://gekon.net/userfiles/file/siraxagozelalunugi.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/41514330430.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/77e0e4c5fa4f85c8029f9963c278e252/gorivawusaguw.pdfIn PDF document text
    • http://vodova51-53.cz/files/42637175751.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/bovedifoxisubatev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=freedom+is+not+free+shiv+khera+pdf+downloadPDF 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_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 18664 bytes
SHA-256: b3c21cc8b59809722a992c58fb6412b397ad1f00fdc43ea1239a056db38d54f6
font_01_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11920 10984 bytes
SHA-256: 769a626260061c2c7ce891670877a0f8df891e606f2d9ad4984cc6d795f803fc

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