Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b2c627d9db87d7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 16:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7a1c0ba7ce0cddab638e50600b170f36 SHA-1: adba020004eaab183bab5e80f0010e03b56fd119 SHA-256: 43b2c627d9db87d7840fec1596c3c028d1d5ac8ccb411c25c1bbad9e4c779924
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into executing malicious content. The document also contains numerous links to external PDF files hosted on various domains, some of which are identified as potentially compromised or disposable hosting. While no scripts were directly extracted, the presence of these links and the ML classifier's high confidence score suggest the document is designed to lead the user to download and execute a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 http://starinviter.com/ckimagefiles/20988178920.pdf In PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27149128554.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f51d00242470b0ebac2347ab6e66c3e8/geguxodivunu.pdfIn PDF document text
    • http://www.toptehnik.si/images/39164269615.pdfIn PDF document text
    • https://yodobashi-church.com/xorafuguxov.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/88032106420.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/katolet.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/bupibabagurokumemoki.pdfIn PDF document text
    • https://blugarden.eu/file/31922264028.pdfIn PDF document text
    • http://builderall.info/userfiles/file/98380446318.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/farokifem.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/vavunigavojaxabuxuw.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/wapiwexe.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/92167718158.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/mekuzige.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/javov.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/rumutameniso.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/40301683210.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/guxizaji.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/tifufoned.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/93144424649.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/kilokukafuxinevage.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614173d093495---siwinafajuko.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/wafupileluviba.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/3aa08ff715f430ef8664669acd4e1345/lixonuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pokemon+let%27s+go+pikachu+for+android+downloadPDF link annotation
    • 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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 11380 bytes
SHA-256: 2b9b45c8ad5f39e790dd7ab1804d95be956e990a372139112d7adb827cf7c3f4
font_01_sfnt_off0000fb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5F 18108 bytes
SHA-256: d6167ce14680a1fb0d4e90169d1055a5f6c872fdb3652ec39b3ebf906346eaed
font_02_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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