Malicious PDF — malware analysis report

Static analysis result for SHA-256 6241edae0b6ecfc2…

MALICIOUS

PDF

70.0 KB Created: 2021-07-02 20:16:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3827cbee337bcecf268ff5eaa1e3f1ff SHA-1: 4f865a52bbdc274d47dc0cd601f43f48ce1de647 SHA-256: 6241edae0b6ecfc2b74562222947e8743ad34ecd060e59ff693d525cfe6dcbd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a malicious link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=little+house+in+the+big+woods+read+online PDF link annotation
    • https://parklanehotel.asia/userfiles/file/36031051380.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/84604233186.pdfIn PDF document text
    • https://noddy.nu/images/file/16551491324.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4f46ed645fc66735ff15512a12ac8ceb/labipunurirede.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c390dceb2d---xinijumewujivojagejafiw.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085204e4edc2---daweribawebufufuwe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/a0n7mtpeurm6vcnli5m07f0h8k/94902892730.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/gclu9bk3p5pg1v0kl9m5qepg31/lulekakuxunixarotinisa.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/597262a39a588c11bed459271c901287/bikukedosi.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/362c62bc90846245de9188a11615b22d/34139790658.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/mowodajexe.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/aac97823dabda248f657b794a4d1529d/59527478060.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/52349410595.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b18f1675---vojifejunegukagob.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b0c748e4fa0ee1c38f29b88e2e040874/lawutivunarufudex.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/zezumebemom.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9i304afk072491i5numc0s850t/betaduzafodaxizuf.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cecf9f1f7d---rumikuforojulofi.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/ebe792f155d9b9e5b6f6e072cd49cbc6/mibutugiwobojuxukakudamof.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/s0hmaa90epjsjd906m21pvl4o8/65409019090.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kk2e1f43k5p691grtgsadv2crl/bamaredojenofuragedomati.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/37489109978.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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 10812 bytes
SHA-256: 904dc7a9310fd67e77b1229c56b8a12bbeecc875676344454161aaa569ba8049
font_02_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 14536 bytes
SHA-256: 83e645f16f1789f8ac15730f1362fa228fe69dea6666b03da971de23c7a4e71d

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