Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf17ff13bda1596c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 01:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a15e074f1c49430b28876127444fefc5 SHA-1: 689d791491d384dda878585cb41c6de643c9c0d6 SHA-256: cf17ff13bda1596cc4b7796d0a3d027ea44692fb59853b42dafca8f523f46a87
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate a 'link farm' pattern, suggesting the document's purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketex.com/trcgp/ckfinder/userfiles/files/kigutipem.pdf In PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/86911037289.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/52175911175.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/zenopefa.pdfIn PDF document text
    • http://vaynhe.com/upload/files/votagumigigug.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/8289486200.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/muromeraxesixezulan.pdfIn PDF document text
    • https://ekransamara.ru/files/lelawerusolabefumoze.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc2c98984---reziveva.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/mamevinetuz.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/ludorawasadesukaripalin.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/59377022229.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/zizimejeguzibopaxufiv.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/16025873406.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/rovisi.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/vanaxaveler.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/situpewodizurewodogewuj.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/87173538652.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0dbca4497fcd1eedaa0780032f980575/50811052878.pdfIn PDF document text
    • http://zeci.nl/im/image/jizuri.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/41067547927.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/rudiwu.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141191834ca8---kejabij.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8bv12ov9d61kes9toj81ib9um3/87344094566.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/rigeluditudaxodi.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/mogofurofilenifute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+rotate+pdf+page+and+savePDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bokakaduv.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_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 17620 bytes
SHA-256: 582483cc70ca8c83f557cd435576f2995c406cfc13f3114ccfc6be89a9bd8871
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 10680 bytes
SHA-256: 1f6c1964a8419aae9e2ed165b1931a4dfd3c42efa5787f7847d0a9bd9d751e7a

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