Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee4b89fccc24507…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 18:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 65f8320e635d7567300fad00e67c051f SHA-1: 91518cfd2bb308023886a4273f9a402c20402d16 SHA-256: dee4b89fccc24507f435562bf4de6ab845de3f8c5efe7ebcf804c05dcde652da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=how+can+you+get+local+channels+on+firestick PDF link annotation
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7d079a34---21539735376.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130703621ca8---bimevedekugiz.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/wujewatifavubizosuxima.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/rifol.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77609137220.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zokawemok.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/nenavinukerojizivadumi.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/fixaxoximomize.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/benererulunu.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pupodaberuji.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/758532fd071920ee72ae766aa84cdde2/27897099901.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/dadoj.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/gafelizevadajevonaxupono.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/55347335779.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/sabedubebiritudajupe.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/39413326.pdfIn PDF document text
    • http://airmon.hu/images/files/27636373783.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/pijaz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pejuvuwiv.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137668771f9a---33446492671.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/8132778719.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/91920166147.pdfIn PDF document text
    • http://armanetti.com/images/84318263555.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_off0000aea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA8 15456 bytes
SHA-256: c05d6ae163d83b3797d02df5d9fcfbde72c319179c6149875546f8191b42ae37
font_01_sfnt_off0000d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C9 11000 bytes
SHA-256: d80dd4aa39a3ba1ae861026f8e118f8b46a79da9fe96b2b740cfc8a5569e0e11
font_02_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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