Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c217c0ad0d9ae1e…

MALICIOUS

PDF

76.1 KB Created: 2021-09-12 03:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9feb1c5050f49fd97a00612c314c98d SHA-1: 1891e59efd5ce976750ca9afa4b297cf7dfff068 SHA-256: 6c217c0ad0d9ae1ea2eb06be0ce726e991cc938d1bc1b833a76171be547a1c5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://geneolock.com/ckfinder/userfiles/files/mafitokobisaved.pdf In PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/zerejib.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/93485368908.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/19778949730.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xekijiwom.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134534b38281---44196915332.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ccec73f7---zatirewizedexebuxaxe.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161321e37ef8bb---85919446290.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5186bf47---tesuko.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/feresuterepufusopomebim.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/dujiwutanuzulune.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/mixibobu.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210905231637.pdfIn PDF document text
    • http://cortabellanews.com/userimages/gejudul.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/supomiwukegejofeki.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/59916322538.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/nixedurugapanubaz.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/resivekoxezo.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414c9aefea---sififotevekumasuvomenezon.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/benakepoxigizix.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/25323672589.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/94029617544.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613505c950128---piwiratedejupukusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fortnite+rebirth+harley+quinn+code+freePDF link annotation
    • https://t.co/mfIn 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_off0000c2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0B 10880 bytes
SHA-256: 808f9c637e3ddf107e19df6469b52a79276912cfc29ce3f62f691bc1509535e0
font_02_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 17796 bytes
SHA-256: 2f161fcd623fbe2c5e9dd95cb800602a72ceb64d66db28f2c1a6211c0667c60f

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