Malicious PDF — malware analysis report

Static analysis result for SHA-256 435a5459bf81f40b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 23:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 410d35063f0813dc07ee4f43eceb9274 SHA-1: 180f75ce8b3c7bc02ec3d9041eada8f7ef70e014 SHA-256: 435a5459bf81f40baafeac3f86593f9e2c742ecbf59b450be289f043fb893a99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript, indicating potential for malicious scripting. The PDF also includes numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm used for distributing further malicious content or phishing attempts. The presence of embedded JavaScript and the nature of the URLs strongly suggest an attempt to redirect the user to malicious sites, likely for phishing or to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4bcf57ff93---demomezawe.pdf In PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/fd418fc2b6426cf3e4561733f6a86a8c/66026156650.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/30322077163.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/be617db93f092383fc5b51124e0c7320/80238609367.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/41025067471.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/gisufusese.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zopezogugukejapuxe.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9bc56c360---94568364665.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/91f873e55ee06124c895f73f45d0e123/tigufabid.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/mokufo.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/moxof.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/bibivomudika.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/tutabinu.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/melelibajax.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/pekomoziwoxoxexotezid.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/togijizuj.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/50600912247.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbba2b963b5---15945567594.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/40524212750.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/96813a32890e52fb5a789719b1da3509/veloxifidopunikaki.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a3ec0860404e05981e1f0a673009a542/12227141433.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e51055728c9---13394406050.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/278975486.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f722113bc1f---6466361541.pdfIn PDF document text
    • http://askort.pl/Upload/file/9103384676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=easter+1916+themes+pdfPDF 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_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 18704 bytes
SHA-256: 3c311ec0c230aabcbd5d8813e350cd40c828daff98d6c907807a065697e55145
font_01_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13103 10772 bytes
SHA-256: d90a8190a548c78369e2f2a8d0438844fe75b038a845095e70b55a8578f1f4aa

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