Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0bf72504087740…

MALICIOUS

PDF

76.3 KB Created: 2021-09-15 11:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc9bc117fc042f2add248ca1e047a423 SHA-1: 82e77ffc25f489a63d3f2d9b2ec615d335465c01 SHA-256: 4f0bf72504087740a8619b83212897644539149fabe4ca28041971bb8ff69d82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://vsevolozhsk.mebel18.com/uploads/files/81446925300.pdf In PDF document text
    • https://anyimaker.com/upload/users/files/fujitafididowitog.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/9892158404.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/rexonovaraletukof.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/zurokuxumarogikojetataliv.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/latodofowuwaxigarubizap.pdfIn PDF document text
    • https://mfdesign.hu/files/file/14211811433.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/48125952922.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/murel.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/15036668088.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/61358151131.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad2fd386f---belizojevoxuzipezaga.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/fexovawu.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/65113520278.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o1k8uceqrjccdl29g0u1qsngt3/saselijovogutobivoropew.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/sixiluraxonubipozob.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3hme4t2u7doqa43a2qnr6gdij1/tuvenu.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/musawonu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614166b408073---43791625562.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6571cf49e9e08149af0dd08e73b8b3c2/16933187981.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6834edd1caa0f2eddc01e7870bc06115/sufixofopesag.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dda4c3e828de55e6f010bf165bd3a8bb/pobajoxi.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/momev.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff01e6e9b3---11276467670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=final+fantasy+tactics+gamesPDF 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_off0000c58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58E 10548 bytes
SHA-256: e2226b25f5eb4852de85088a4200dfb6172248c3e0dddc40427ed7bc793f0eb6
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 17640 bytes
SHA-256: cb38e046fc41b2269ffcdcf99f26854bbd75a58526672da0306d2fcd9b8120de
font_02_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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