Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fd8cc94d3ab350…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 08:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8651b62a6c8a0c84506bae978887e992 SHA-1: 4ae3dee1c89c63e246ae34932770b9dd57df3846 SHA-256: 74fd8cc94d3ab35034239b3b1ec669f04e358a6564c41663410dc29c4503bf97
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various external websites. Several heuristics indicate these links are associated with compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=my+sister+the+vampire+book+18+pdf PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/25630226267.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/33587929992.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/nosigababobexulujorilurek.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/57bf77b39812cf4d1a42fefafc00873d/40910157249.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9279b1de6ec76310ade6c57a087851de/radinetamupul.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/zugubo.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/46370919187.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/16226013961.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/zudof.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9bfb7819---gavepinunubupezojefef.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/xalimimasutotilebudose.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/161013478e6a02---zegepaxanekugusibizorif.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3cadf480ed43e7c8a2e43521b5cf6979/58397871199.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/12915197857.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/suxojuwoferetezaraf.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb59207e4d---vosem.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e84235c5bbb051d7029d5c31f84cf537/lezazikututeb.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/gij9kspracktih0g17o0osru8f/83111317993.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/98616459558.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/525d1a668e1c38fc88e464d77ab223ec/julalovimegag.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_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 11276 bytes
SHA-256: 87835dc652d10d65c8720faa9ac9e2eb59bf8e8e58647ccf6ea5baf59e496e5a
font_02_sfnt_off0001123a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123A 18696 bytes
SHA-256: bfee63905e2a06511dddcd31c9581fdd37e40ab0dc598774e7512ec4dc78ad83

Open this report in the interactive analyzer, or submit your own file for analysis.