Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ec0ae03cd94a35…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 17:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 18275fb8f4fb7d82f81e270f4cbf0073 SHA-1: 0a577748f2e4eee9a9e1e7f57dc7803de28516d3 SHA-256: 59ec0ae03cd94a3557440e4ce29d6a33cb8198d161f03543cf23f97a837d2d1f
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious sites. Heuristics suggest a link farm on compromised CMS uploads and disposable hosting, likely serving as a lure for phishing or malware delivery. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=emulador+de+android+root+para+pc PDF link annotation
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/72565327677.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc137d26e---86055214356.pdfIn PDF document text
    • https://isleo.com/i_photos/file/62656207658.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/44564173609.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/32042129949.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/rokarugeramininoxux.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/dalowobajode.pdfIn PDF document text
    • http://pronobile.com/catalog/file/wanuzuguketapenejedimavu.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/tovonemuripozejabake.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/93752735960.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/folofodenu.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/33916152000.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/xepewajipogabanita.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/vewilakeboretekapekezasof.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/80590661816.pdfIn PDF document text
    • http://rvhifi.cz/files/file/mosuganovakosinoziruf.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9b8661a0b---tukinovabeposadafupa.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/75009456994.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf58ab663---fixiviragadisixovupasax.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/81cc1e076e214a9bde3e5715e2f291f0/bejusavipu.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/68881069539.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/naguzobivamavefiso.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/nebifawiluvijovi.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/3612699344.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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 20680 bytes
SHA-256: 4c19f440b42769864da6bba0e53d576fd216397a4ed799f1406e81ebe70e39ea
font_01_sfnt_off00011270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 10592 bytes
SHA-256: 25bd42611697f246137a388b4fa63da627b537ce2ee7a55ef2037f8e49a796d1

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