Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8adbfa0c63b33…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 08:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50d326e2f7928b22d52650a3e8f13468 SHA-1: 8577578c73c8febad6dab47a1d976e4b8c05cee0 SHA-256: 9cd8adbfa0c63b33cf1364bd863ab1470e9cd0dfe39541d188663aac5c120cab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=morgan+sample+size+table+pdf PDF link annotation
    • http://sahamit.net/userfiles/file/57640318223.pdfIn PDF document text
    • https://udruga-invalida.hr/files/59037685869.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/fonumogeram.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/89547658745.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/nitasovasiridox.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/3c7d5e9df11826ecff9fff6c73018c0e/82784595170.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d0b6ac20---71784615204.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/towumakevezalef.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/40665011855.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b863475204e---ralula.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/40330049398.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/lu525pqotirqvugbita708tsmk/8264179055.pdfIn PDF document text
    • http://jaatkinson.com/userimages/varidozotizojevejis.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/0db32e133ce9f8825de9548bf0ee7f77/xofomukavun.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/912418768737d99dfeca002a2e86591a/nupodim.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd1a74791---95752048969.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a8c13c569ce661e20aeb443c34139f1/rogarovajomekadowebuz.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/fivulejonofo.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/kejixiniw.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/beriguxosemudevopefiwix.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/40311692560.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_off0000cbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBB 11032 bytes
SHA-256: 45b82dacbcbd0e395520cc3a266b0d7424d50ce030b58d782bd2b15818e430ae
font_01_sfnt_off0000e4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F8 16808 bytes
SHA-256: dd4f41fff94c738efcd1b838a0193e47b544d285f6f4338d5f16328813be615b
font_02_sfnt_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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