Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15454cf95e755fc…

MALICIOUS

PDF

68.2 KB Created: 2021-10-03 05:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9b9248cb0bf14d37c00365f128aabe62 SHA-1: e0c2453f4d0ea1ad10fa35de69cd498edf2de42c SHA-256: d15454cf95e755fcc72061739f6ea5ac35839030c6c2a86ba33cbde467cf6329
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://smidgel.ru/uplcv?utm_term=good+dares+for+online+friends PDF link annotation
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vilozowi.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/33612700808.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/39147784176.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/pshq05nkkpm879nn63comm13bh/jimexanakorutag.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/2253619769.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091100452334948.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/nudetixetozolesobuzubafu.pdfIn PDF document text
    • http://autodilygood.cz/files/file/34697844257.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/fiboxuzalofelujefafuxo.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/tijobironolo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52251842170.pdfIn PDF document text
    • http://servmed.net/userfiles/file/jogonuvoboviluvebaloxe.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161475d9a73bab---17516853489.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16151a6f8a3a61---27841995109.pdfIn PDF document text
    • http://tulga.ru/editor/files/bipagavuvubo.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/nodoj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613767bd8932e---remele.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc76eb316f---xasojotixasus.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/47297648033.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/91204939282.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615396c98f8f6---60654294151.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/zofobomavadiwupinawejab.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_off0000ada5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 15424 bytes
SHA-256: a1c47db4e6e14c71a9d5187b51787cccdcd881002f1b028748427e29ca1a5f27
font_02_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10288 bytes
SHA-256: b269b9f6adb3b7af46b90428ddfeb9db39cf3a9d48c70264ae70f621baa25bb3

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