Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d788278659675c6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 12:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c7745a5882fe188ed157de7e5f2d848 SHA-1: cd4e74040211274ce62f77209b6a8253abc13c14 SHA-256: 8d788278659675c6f140bb9545e2d9d89d40f74894ab830e896dd8b6123baefc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

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://oniceh.ru/uplcv?utm_term=pdf+surveying+instruments PDF link annotation
    • http://mariamozharova.ru/uploads/files/29449168480.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/33897079011.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/66655252571.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/nufexapusumekisub.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d85ab8d361e98d7e962c6f8556b8454a/14153576340.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/sugoxotuve.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/46806549529.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/ropipubujifutin.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/86745839078.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-3/20210803085434564042.pdfIn PDF document text
    • http://katheran.com/clients/55933/File/26611616403.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/lbo0j9ekacmripaohk3gd62691/54403955039.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/mofusu.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/14632297804.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e2809e9d---xudaforadekinesezezob.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/zemigifuxelutawuruxi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe0fd99a63---dikasimazononezisupasumu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fa63ff75eccc05fa7ee95f28861cf6dd/xinonokanetogivikojixoke.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/jiveserumurivolodakat.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/donatilirefedexoripexupu.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/labapolemewojuxitowabu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a424f40ef---82120151546.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/6785863334.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611d05a05cb74---basowatupidakowono.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_off0000bc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2F 10652 bytes
SHA-256: 4e1173d85d1a611fb535b830b5e712d706d8bc3bd8b1789030de546fb35d72b9
font_01_sfnt_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 16408 bytes
SHA-256: fa15941a61aaa1b988b500e353a45f753c436090a54ce5a00a02e5e908ca7e07
font_02_sfnt_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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