Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac3f23eb4027766…

MALICIOUS

PDF

90.2 KB Created: 2021-06-28 19:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1144ef9066b13c30105e33ba6da6686e SHA-1: d2bd965836f45d9d71edb4218650a8c7b0334cc1 SHA-256: 6ac3f23eb4027766523d133b88ffcfe3c006813a707b8f66393db80e1f361801
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://coretry.ru/uplcv?utm_term=square+acrylic+nails PDF link annotation
    • http://mosjob.ru/images/file/vexakefesawofazevadej.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c9eb9dc79---78371324420.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/69842608093.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608841dad38a0---78035281433.pdfIn PDF document text
    • https://bataretak.com/img/files/file/82014471024.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/15416927635.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce45e28db9b---72143376652.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbff8ee367---jarinusajeb.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/42434636493.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/xolipepipa.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e5535784472594a55cba0be1eaed022f/98718916938.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/aol7qbbldv2rpbfjgvb3sof62j/81477629891.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0efaa4caa2---nipexixedaronebowajatuxaj.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842194011c8---latobejunokikep.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/99923315322.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/56766955700.pdfIn PDF document text
    • https://anfauglir.com/images/file/99107051149.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/wudozipokokotuwob.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/79475227160.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/761143fb4eac1d16789661c07d6b58af/jebuvelosizavew.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wazokixutugoragonasezifep.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608e39ada0fa3---73099801416.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f384c83c56---37259921370.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bm79vgclm5tcvihj8bjmh602s9/34502447660.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baac54c8f---63685476467.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b433fcc18dc---dawutosulomifemefevi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/5518d6ec0b9e9ee8969daaf83931b81a/96246876122.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_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 10440 bytes
SHA-256: 28d6d29d871cd73550c1e555ce2f501464c911580ddaab32d2c25985cfc465ae
font_01_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 16196 bytes
SHA-256: 0782c51fd32f656768faee0c1edd47112a4f5369f8e666d031629067c4e189c8
font_02_sfnt_off000143a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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