Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c2b1ce71b38cd6…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 04:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d58d48c9db63e4c9bc594c9b5a667266 SHA-1: ad4585eb1cc1fbcba3fdd8d33eb7906f0ff76b79 SHA-256: 66c2b1ce71b38cd6373d6e810f151d9db779af6f67a20adc3e9fa1edcb56afc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=ennama+jimikki+kammal+mp3+song+download+masstamilan PDF link annotation
    • http://www.huntsvillepr.com/files/files/fibubu.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/fuwazedudusa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16074fa8a1c833---55323953761.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92055042778.pdfIn PDF document text
    • http://brukbet.com/user_images/file/vavifosiv.pdfIn PDF document text
    • http://simonide.org/userfiles/file/89043050285.pdfIn PDF document text
    • http://belst.by/upload/file/49951744908.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626122164.pdfIn PDF document text
    • http://maidichike.com/upload/files/19640681029.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/f13qq6663ga63r75v9psjpd8h6/jovokosewofulux.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/marifufa.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a008020896f---17212693678.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efe0accb73d---balulumuk.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/tobepifodizukagog.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/21596198669.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee31da4f63---91769061041.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/wuxedinowupenuvugo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132351e6b1---89445160564.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/wafilakaturobasixi.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/7b0c2d08412854d4e2f23e4443a79861/66403036300.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/32d74ce69948d3863f0c7c93d66b36b3/91255199469.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/35659803458.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948077af4ac---rojisizovojepuxufepo.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/23203531008.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_off0000dc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC85 16720 bytes
SHA-256: 4eeb6961d0fc62393cf6de6c0369311efb8bdaf643a6af36130efa50f1bebac2
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 10968 bytes
SHA-256: 38643948eb43289421b928e0d7a5600a7bdbb1a0da32d1b53d6bc454b6d66745
font_02_sfnt_off00012154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1