Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb7749465749bf6b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 13:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c03e32aa79ebe0ed4605f00c529bc609 SHA-1: 0c1f50995c9cdb7dc03e4b5f5083d3f4329cab54 SHA-256: eb7749465749bf6b8dc997591c9e82379545a6e60523caa87f5da427148975f3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious links. Heuristics identify it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting its purpose is to redirect users to malicious sites. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vanxuantravel.com/upload/files/xopanovuxibaxudow.pdf In PDF document text
    • http://progetec.org/userfiles/files/87978223978.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/2318186869.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe1387dd14---354431627.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cd2d78f---mizawejilenopar.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613460840151d---15305119259.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/89979197825.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/vidarerojuxizip.pdfIn PDF document text
    • http://ipceurope.com/assets/file/49979937124.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d6450749---71702504320.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/26858943870.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/52559111658.pdfIn PDF document text
    • https://windsbs.biz/files/file/77487813972.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/wasakizojupumoreweniza.pdfIn PDF document text
    • http://rc-modeller.se/images/file///99197069922.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/43240531237.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/rularovumev.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/47970900389.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/33081534417.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r7mhd84hnst7jg89fipf1sqj0e/jukovufibinujijafofele.pdfIn PDF document text
    • http://esipro.be/userfiles/file/22137436164.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/51998152385.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/97436266540.pdfIn PDF document text
    • http://annabarons.lv/files/files/75560048625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=send+files+through+bluetoothPDF 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_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 17696 bytes
SHA-256: a074d50c700aa726a37d5232d61c144ab7916577da13c87578f6b6b3cd6991a6
font_01_sfnt_off0000f977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10784 bytes
SHA-256: 84b78ff632580134ad8f6066c9b151a583baf4e3ea073d14646984bfaea83857

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