Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d510d207ada2cb…

MALICIOUS

PDF

91.5 KB Created: 2021-09-08 13:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c6f4d1f76662cd52f9b4b7b26624de8b SHA-1: cad267ad272a69257dcd326ca9eafcec6fbae810 SHA-256: 59d510d207ada2cb7feedc5bec7a6cfb6015d6db135115fff8bdf9609fc67048
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files. The presence of a 'Download Now' lure further supports this. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://citronel.com/userfiles/files/1562404232.pdf In PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pugtvi82si22tvgqtpndbolb7n/jijamedomegofawi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134403ecf261---86863922341.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/ruvozalixevigapa.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/27548905266.pdfIn PDF document text
    • https://csn-alliance.com/data/files/favudaxonarapeguxe.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/posemetuwotibe.pdfIn PDF document text
    • http://allier-genealogie.org/File:/56478182540.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902215423182.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/34895203500.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/97563496716.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/23204744782.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/86ef3b401ef930b895661752445fd9a3/99337544154.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/vuvejijudapi.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/fudem.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/25748173294.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/13547244062.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109011320468068.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/tojobipepo.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/74610232180.pdfIn PDF document text
    • http://accronline.com/userfiles/file/mutilab.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/78554252496.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/zosapukanewapalapomato.pdfIn PDF document text
    • https://aedwea.com/upload/foto/xupawixekunezitajose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=connectors+worksheet+for+grade+3PDF 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_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 18672 bytes
SHA-256: 08920c1a66ba91c615ef4e9cb7c22ce13e491e4b384c94854cc814c93856f703
font_02_sfnt_off000146b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B9 11000 bytes
SHA-256: 7e4acfe46c077b990c6d658ba9d5835bd90ef8f31fd857ae73e6ab22a8b0c6c8

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