Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5e09051c9333d30…

MALICIOUS

PDF

98.6 KB Created: 2021-09-15 10:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f6ba4c67a16ace1d3db44c035809002 SHA-1: c101bc5e7a6595189231ab79e0880ba7c0d3b79a SHA-256: e5e09051c9333d30d695ff5c72fc8eab112bffaf9bbbaaac4edb644979581e70
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and leverage compromised infrastructure. The primary goal appears to be redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://epoptavky.com/is/images/FCKeditor/File/14222252033.pdf In PDF document text
    • https://auto826.vnpec.xyz/uploads/files/dirore.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/59620801280.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109020943148539.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/rasabakukurokuda.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210902_F135DDDF8F53EB0E.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161370d2ab6fa4---botigakakewojepavozik.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161319f71dfb76---zadopo.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///63352327867.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/42885185481.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5cbf1af575039972024ea4268b2ec32a/87847757547.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97091995568.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/6958869994.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412fad7d0f5---venosizarezat.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/22353952568.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/93143645297.pdfIn PDF document text
    • https://mbbs.hr/files/79246565362.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/saxolufenerusuxowajuwulu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf70d8bcf---devefusiloxurusimovani.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/58388565988.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/bukenakogowijuzagedugexu.pdfIn PDF document text
    • http://all-premium.com/user_file/files/54437868603.pdfIn PDF document text
    • http://apvn.info/userfiles/file/maxekelelonuxom.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/91024102193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=resident+evil+village+8+apk+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 10964 bytes
SHA-256: 317c1a8877695f44222dd5f049318dbd4136d0004980bd53d9ce3ba55d128c54
font_01_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 1872 bytes
SHA-256: 7286ebf10b6160c9da72d5fc3cf1f7f2560605c729a3ae36a169f4463a46d3d5
font_03_sfnt_off00012359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12359 25704 bytes
SHA-256: 0a75618ce0c90f20b1b9f098c41160d5e3d81c6816169e7a41b06de4dca2cb8d
font_04_sfnt_off00016435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16435 16584 bytes
SHA-256: c8c0f53e753130b12c118dc60bb089fe1503c9b3fc04ae8e9f08dd415c6fe3da

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