Malicious PDF — malware analysis report

Static analysis result for SHA-256 28234cf0386653b3…

MALICIOUS

PDF

76.2 KB Created: 2021-09-01 13:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3050d0b53846c83b4c3ee2e0bdbba32 SHA-1: b2d9090527fe828ec29ed9d143d8386e83c2cc48 SHA-256: 28234cf0386653b350873d94f8f64276ad03f7768c86659d166d462bfc62c6a0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to host a collection of links rather than display readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://itandem.net/ckfinder/userfiles/files/79132284699.pdf In PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/vasigapupoweseragi.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/4939f0b464027d13a3b659c092474f7a/2154143339.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16085c76f4cfa6---saradukomufogawe.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6b7db51e1---padavinasuzinonenem.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/nuzita.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/93434839697.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/98369198827.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/46243383993.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/34830298744.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/dumuwijazokur.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded536737e---66842296789.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/tasegugijanugovibugudo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080dda391968---82920727473.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/minunedipopab.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/32589327934.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/vafowadunulupa.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/bc0c138c62651e1775e051f820e9e511/gabadomopo.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/18/41918182527.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/80684955387.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/pesiwotezujaxig.pdfIn PDF document text
    • https://designclarf.it/file/rivuwofobi.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/reresuxuzuvup.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/dozobererumijegozubivipi.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6bdb310c8cde6554d2c8da4e132ebfa3/fefegomasulizir.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/83860608804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+lighthouse+streaming+freePDF 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_off0000c7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7ED 10724 bytes
SHA-256: 19b9052723b31e4bd8a880a7c4d421a355b7dbc82d1f0cc1c23df2fd5d730e03
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF879 16560 bytes
SHA-256: ab2558e01478ba93d0d6ff20ce9f1646deee3275f8e1bdef98a138a5cf00c756

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