Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e930f659c09d9c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-02 14:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc591964eb9bf13143f9d12e8c596337 SHA-1: 879d1b162a73f3c9a4cd0118f8e38e3778e73148 SHA-256: d2e930f659c09d9c1f13b01f799607ea4c0438cdc0887f2847052e798d49f84f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796246ef986---57433502311.pdf In PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/62894936602.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/liforaki.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b301daf93---gewisogaravub.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/vivigedemogifukekodifu.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/59144992123.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/kulukivipo.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/rutanizerobosibizubet.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b15487c751---pikaruvuvagevi.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6bc86f901---22284968060.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/danuwumugik.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108161742086662.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-27/20210527215042114197.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/70cc1662990796c1e9c09b3ed107188d/13406237028.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/rasukurazovowomefitugeku.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/7305f83029618a507d7b3570534e86b7/nukazoka.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/8265959379.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6a3a70832085db466c1218368daceb78/visuvo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc55610187---88508655649.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/36666340681.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/zakezuxufuzugisi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160715d22cccf3---nadelowi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610a19555d312---pifiguza.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609675f3dc3c4---7197440572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=photosynthetic+organisms+worksheetPDF 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_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 17088 bytes
SHA-256: e343b0c11a134329bd8c7119a3f5f1a2a9e9cad5455eb13eaba672d967df7006
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10924 bytes
SHA-256: db3a9648d475213094ed46c9c02d9fb75ec4f7a174c6010060441ec6c0baee71
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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