Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbf456c27619d32…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 21:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d430990b2ceab6b1c0358888846920bc SHA-1: 1eb59e74dc0dcc565c0653eaf0932a3c9e5e6432 SHA-256: 7dbf456c27619d320e56aaee9a8e7f075ed4f9fb5597e9d22a455cc4ada6e745
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious content, likely for phishing or further malware delivery.

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://drafthe.ru/uplcv?utm_term=thermodynamics+by+pk+nag+pdf PDF link annotation
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d2dvbt0dvbujfcq7u1meha848e/39878575648.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/nuwomatelemigeloxiwoletuf.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7f1427169cf963eee2edb7f1f7f905e9/84516466105.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160796cf364564---62498922511.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/81446609220.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/70865425757.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/86e9a15004da295c8bd458c30651556e/jomovulujopovetujegemiba.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/44231194527.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/92950037423.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcc0147218---75714130521.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/zutegigibipujuwigowe.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/18184171155.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/ninopebovaremulijad.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/netofubejoxe.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a758ab75db2---kevekez.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6d97cafa90a563ca4a1ac04a78cccf39/goxajimijolexuzufugivo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ff8072e50---57601944586.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/bozarimajegodobuduj.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/dupago.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4accebb1---nofizebenapatovid.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096772199814---27971620774.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16271184143914.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161291a13da995---25541201190.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_off0000b8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FF 16224 bytes
SHA-256: 4d68dbdd5a1b141ea2349180933cc28fdf8c4125f6ccb60bdfe6ff9bc08d27fc
font_02_sfnt_off0000fa9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9F 11232 bytes
SHA-256: 6a17e83e34366f1390e7381d9c07c0f9b95f409d3171499371e84ac217e43a3b

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