Malicious PDF — malware analysis report

Static analysis result for SHA-256 98608b9818990757…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 04:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 0686779652fc5afb1caf85d9f37fb639 SHA-1: 7381ee6735030ab2f91df156b5426581f181193f SHA-256: 98608b98189907579c420848f4c68250b1d97d91b630a32cd5293b62bc0c22cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+much+android+app+development+cost PDF link annotation
    • https://consurs.ro/ckfinder/userfiles/files/dalanosuzup.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/jizedipuxun.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/resefudumevakixefadozapon.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/mabilaxev.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/uedsm52r73nlvjg76s5d70blnq/vupevekevo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/682e9c2d4feecb22a845ec3b7fac5dd2/98396128961.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/82434666413.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/74702500792.pdfIn PDF document text
    • http://jucal.es/images/file/67974206265.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/kodibarovip.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gjut8k0b2uqear1v4m6cf0gdhn/fujogezabuta.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3d83e588---27594321267.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/25286790829.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/taxogavexud.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408be9753da---15808493116.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/22951536929.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613862816441d---32842708217.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/38860664234.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/80732645315.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/rurimibebedu.pdfIn PDF document text
    • http://imotrading.com/images/userfiles/72645960504.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/gojuninekol.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134316a6886f---posavokiporefubo.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/46877544097.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_off0000e75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75C 18596 bytes
SHA-256: 10f0c8f2ea7499bdc4b59b10233ae03b82af11d6af87235c5cf943a9d177ab88
font_01_sfnt_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 11024 bytes
SHA-256: 3196c54060dfa49788bc3570bac5126be45f3597eafbba8e20bd109e30ce5d8d
font_02_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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