Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47407ce84ee69d9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 12:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 016929de0e05914b8ffcad313d316e92 SHA-1: 7ebd89868e16b300b5b5343be56e329594f54aab SHA-256: f47407ce84ee69d901c531e4f74e3bb7cc9e2665bb877b1c861f6cc1d08c788a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with known phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://ketchas.ru/uplcv?utm_term=esl+directions+worksheet+pdf PDF link annotation
    • https://kme.pl/global/app/webroot/uploads/file/16306071471281.pdfIn PDF document text
    • http://ms2oke.com/contents/files/65762432353.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/13376450727.pdfIn PDF document text
    • http://leton.pl/userfiles/file/faxuronero.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/19418942908.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/94714924472.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wosofatizokeravujofozit.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/vumolufijusevameni.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/jezogate.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/zevematofiruloku.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/62834072649.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/44928098071.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369c3713bed---zimuletijebi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16133972025f50---64824620986.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tagobokomegagedi.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/45298346372.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vc300frc9mcfj19ohmf23k90bo/39705276935.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/16073528044.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/89841750102.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/vizufoxugofosavuzumuror.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gifagadejijovarefulibez.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/87394303496.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210903051143.pdfIn PDF document text
    • http://saimiri.name/upload/file/46477080930.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161315f1f8071e---10458453142.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/sosaxufovepidu.pdfIn 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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 10716 bytes
SHA-256: d1671ce0febd084c556de88241d7305ae60e7088e7f38278d52ca20a62afcaa3
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 17664 bytes
SHA-256: 1e7e0c7a22eafc34f2f5b7d569a59bfe6d61bc3deac5b95816d9cb76aaf5cf19
font_02_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1