Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef69cb1c54cfb126…

MALICIOUS

PDF

88.8 KB Created: 2021-08-14 15:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5a9433d2118f1f64e4dd2047d231caf3 SHA-1: 35c1a6606e95f2375e0c14d70f723c877d0fff5f SHA-256: ef69cb1c54cfb126b2ee2f33e663ecf697ffa976a7cfa35cccfd215017f86171
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://pistant.ru/uplcv?utm_term=atividades+quimica+9+ano PDF link annotation
    • http://stphilomenaonline.org/userfiles/file/bepotiwosimagobafovox.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2637cf1d9a---kotozed.pdfIn PDF document text
    • https://shidoremicrosys.com/media/30764228918.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/29834682543.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/kefibavonufugologilorepe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f199f88ec1---gagidufevowip.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e1f1376dc---safileru.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210607080602_odgl9y.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/donuma.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/91039161662.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609472544e3b9---jiwunezanizamewixavazeset.pdfIn PDF document text
    • http://mooneyes.pl/userfiles/file/82987652604.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/d632agp3nskinrjp48q413fcde/31809904580.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/b84thijj3gdr71hh1sjo71esfd/sifolerugesu.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/58548923533.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ebbdb7f2c---98518706987.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/90529897413.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1fa7aa31---lagekizezovavidenesokej.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/83bd32d3961dad98210af5ca09c04424/94473834430.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737a7381067---dujivum.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/xevaxivegomesajixejeve.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b269d0ca66a---nonokobope.pdfIn 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_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10844 bytes
SHA-256: fd61d0b00acc164dd2b63512b66473fa61a2df0b42ca3b050c7728f08a104efd
font_01_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 19568 bytes
SHA-256: 34d1ddc108855a06d772429dfedcd41c5bc0daa3a2f095b2fdbd4f949d50fa65
font_02_sfnt_off0001442d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1