Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b56ba06e08d3a4…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 10:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d95c69ad43f5cea4187175818de368c SHA-1: 9c657df2019d8a732c851662a481c1cc5abcb765 SHA-256: 56b56ba06e08d3a43b05da88ffe6a845c172e5514caf04b8bf728c71fc70048f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to various disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and potentially leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://originalbau.hu/imagesfiles/befugukajorobagar.pdf In PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/8293307490.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091723214812.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/23102365647.pdfIn PDF document text
    • http://i-physiology.ru/upload/kuvome.pdfIn PDF document text
    • http://ministerium.pt/files/zadanalapu.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/61459710621.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/th0d9qrns4d7630fq5ad5nu2t6/xovezi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc8f3b64---japusapopitinisajapul.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6490a0266c100b3dbf5839943b67fea8/tarovazobiwasokiz.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/jobagepubemanewubipaxorov.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469d4b37dc5---jonididemakafinup.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/mukuradabuzuboviveforo.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/94147406876.pdfIn PDF document text
    • http://datcat.vn/2018/file/92333794778.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/86576203915.pdfIn PDF document text
    • https://dalba.net/other_files/File/terurugunevojegumanazawaf.pdfIn PDF document text
    • http://clickvay.com/upload/files/dojigewininoropipawiwuxo.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/81952695822.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/15228551388.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/jiwigunogokazolubitakab.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/4749305087.pdfIn PDF document text
    • https://premiersuli.hu/files/files/nupusodafazogujawuzawepik.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/26070263463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=google+play+game+downloadsPDF 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_off0000b437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4E 10684 bytes
SHA-256: da8e79f80e9ad19ab8977fa4f066b1a6faf33423556311893801552097f1f9c2
font_02_sfnt_off0000e4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B6 17240 bytes
SHA-256: 1b1c269f3929444d048c8a4ef6f61f18ea8d26373c09430b10cfa5bc8c6ca8e2

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