Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cf6c7a853d1851…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 02:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8205fe4dad7094bac56526630869bb8 SHA-1: 8388cae5f2c84e4017377133d566fe8c2c3ae170 SHA-256: d9cf6c7a853d18519c2dacec569320278a42da7ab133a27f6d7c592caf93e793
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further suggests an attempt to execute malicious code or facilitate the redirection process. ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=pixel+4a+5g+face+unlock PDF link annotation
    • http://casaperugia.fr/userfiles/file/47351478176.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b59872568---rogopasiwam.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/21429390418.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/63663126175.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/59011580413.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/wenitojisifogapavejudov.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/romojuxatimazariwuzef.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/niwatatarad.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/losonijuvizikezazinivurux.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/45574980543.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/deneganokururojofirakux.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/24703389269.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/43985770316.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/78079384165.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/20493513897.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/8938505460.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/dudagawabobojudiguta.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/gudix.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f4573afc6---damegaburusep.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/45825116847.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/70335064764.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c02604891---82333917483.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/54186303124.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/255074085.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/madegebimukemiputufewaju.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/63361749771.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_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 17832 bytes
SHA-256: 6cc4bd10a29d536f85503447a81a90f49a29cd264b42bec9ce446a1d7400c2e3
font_02_sfnt_off00011c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 10652 bytes
SHA-256: 62f4e573ece22840b29280dceb0fe9bfe484fcab4e924c5f60c0eb52018b930c

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