Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3566dd5b8d267f…

MALICIOUS

PDF

72.7 KB Created: 2021-07-04 23:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b5b3378544a66f3bab93353d658d5838 SHA-1: 9224705a56e3d575766c930fd803c52c91734289 SHA-256: af3566dd5b8d267fee98e6a8e1422c502df5c4818a30c9da554d710c54387784
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to external websites, many of which are hosted on compromised or disposable domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://envida-nieuws.nl/bsb_website/upload_fck/file/64987169092.pdf In PDF document text
    • https://arhometutor.com/userfiles/file/9913525620.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/95685344060.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8d41eeabe---tewekexaledam.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aff22dd462c---jepirevitib.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/4ed0301f182c1ea1099a67bfef4c58f0/xixudalatobebe.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/26381426844.pdfIn PDF document text
    • https://ecoretras.com/file/gigilezibafedusododidep.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe92e4727---70158536846.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/nibufabiripabaribamawibu.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021051204254_355275581.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/4926701503.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/johp1r2f4jdf4pgg6v21cj874g/95380656260.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/xanegam.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/12376370699.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739edaf0c5a---xijibamoruladoji.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/78478193617.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/pnuop8qsdpahv57shlel7fruk0/15557516436.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/66022427115.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160940b789fb65---83652045619.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/62479647099.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210628_36B80D6F357296A1.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/55896878384.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/59891987260.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c28de99f8e7---23442277928.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee63e5ac7---dibaxipolalububen.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7rq32hclhs12v9su3eq0geo83a/vevinadeduvavexaxe.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/40c5654422121fc556254263df95e65d/ganusefojez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=acidity+and+basicity+of+waterPDF 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_off0000bc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC66 10744 bytes
SHA-256: 0b2a8f41160bdf7353092a8b470a990a88d19c1d0619f8a88d0400fc2d8082b9
font_01_sfnt_off0000d55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55C 15516 bytes
SHA-256: e6e07ea08fc69f30dd98c8fe40a30a0b10c00dc733e1e8e2ab41f6a888f20751
font_02_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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