Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff05634bd73c7769…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 08:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57def0fa805502d00719747448c37400 SHA-1: 1c15f0dbb93ddd8f891ae032e372cce9982d3da9 SHA-256: ff05634bd73c776926636ad9526d96883ac95f01f3a383a7cf0236e40211f0d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of multiple PDF link farm heuristics suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://maychebiengoduykhuong.com/media/ftp/file/97044042293.pdf In PDF document text
    • https://reitinguok.lt/userfiles/file/43773091789.pdfIn PDF document text
    • http://seamacros.com/upload/file/gopifekasojexidivifowuvug.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/4196561570.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f52916a2493aa93841e3c1e8a3563caa/pagesuxuzisototoxogit.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a801a6603ff---sumogedifife.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deedc4d64a0---96553748557.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/89292094856.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/63676071865.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/rixoturemisitulesuzomalo.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/xigadata.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/13635005a2c1a8670b0e3d849d9a9187/zosozopaguwikedotufefen.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078734131847---87217080885.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074766fbfb8a---fadogixafozovix.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd49e53446---jenopovugozoxapatan.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/31389011193.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/98208815488.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/29412812871.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d210a03007---88758546277.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35331229889.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a76fc5a28---63998300084.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d740c8a2b5---8577989578.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3213e30322---xewezaribaxikuwix.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/bizozimapupipexega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=law+enforcement+phonetic+alphabet+pdfPDF 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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 10900 bytes
SHA-256: 2d211f43ff7c9a56b339a7d4d7a9e5d2d148b8df360820ed1e3635941f671052
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 17380 bytes
SHA-256: 583e1a7b6a6a3b88fec6f5cc2caabe7596c6e5e6c19a3af3b6b5b4ab2a22b7da
font_02_sfnt_off000123c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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