Malicious PDF — malware analysis report

Static analysis result for SHA-256 7964224979e8bb61…

MALICIOUS

PDF

70.8 KB Created: 2021-09-18 06:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48e652b457cd28cc309fca9a272e98dc SHA-1: e5ceb4ca16f78f62923cdc3d6a04137eb5da2329 SHA-256: 7964224979e8bb614f4553678698bf175083b7c5061cbfb42e426be316fe9617
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm pointing to multiple compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the detection suggest it could exploit PDF vulnerabilities or lead to malicious JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://e-ssuances.com/ckfinder/userfiles/files/roxefaxawiruxifekagate.pdf In PDF document text
    • http://marinda.ru/pics/images/file/69236668822.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/ph99u5dtl2v9n39jelhmqmnt8v/7046641015.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/13607812834.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/9d04f294a5294d6e07a056d268df7115/gefenazoragemixo.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/98394655525.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/45534210235.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/kozevomuk.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/21831265665.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/jefojosipiruduxef.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/94521302716.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3d1478c1bd043d8385efc4c738b19d9f/rajevirawaleno.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikapimar.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161361ef699d11---71216470457.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/sazulamivadojawerokipej.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/nezivopibexujamigeka.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/87144855735.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/vujipadamigut.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/57266084584.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/foxefugatapirizu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/baxinikilezapofezomolep.pdfIn PDF document text
    • http://le383.com/uploads/files/xulimanarakimaj.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/dofapoxilepi.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/99037659372.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109041052583538.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=miui+12+for+mi+a3PDF 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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 16276 bytes
SHA-256: 6635e8b69298120c855a5484564493f5acb63cfac5ee038bef2121c1dfeb852d
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 10264 bytes
SHA-256: 1712ce8f20892aecc91a9b1bdc03754ff026cf22d7e807b83a8c0996f9840b74
font_02_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1