Malicious PDF — malware analysis report

Static analysis result for SHA-256 84867fcc41c51c98…

MALICIOUS

PDF

81.3 KB Created: 2021-06-14 02:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 477f63d39d26b2e8f6ee9b99586bab6e SHA-1: aa7a4d1c8e7d346d108415b871bb8264d77fb9dd SHA-256: 84867fcc41c51c98baa3d7a65ecd13cc78c16043121d0ab73dcee048893b2ed9
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=dlcs+horizon+zero+dawn PDF link annotation
    • https://baxsporthorses.nl/userfiles/file/94254835715.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706806bd24c---bovewivof.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/fixago.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/edf25cb96b672684771091ec2bb4658a/nazofafufiwizoxijesazas.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/riiptjm3dnnqd6r5o39bfa7l2d/pefederolirukuwedub.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/16872462108.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/16221161021.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/13433649934.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fb5thaj69c304tb5s73qsnr3fe/13720260094.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/11077761065.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2a0c5af7---49405396917.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/64908306536.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/noneje.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a829c351c---kufigemubefapamax.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d12e8885ceb4db91556a93490eca3daf/jiraku.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/31661103361.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1417e703f---80821757392.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/linedil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 5168 bytes
SHA-256: 86a5c643bf5484b7cbf8a6944392c0176e1207c725fd2d613f1cd90aa81e0f25
font_01_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 11380 bytes
SHA-256: 18289ed983eb20f1189001a530c02560af7002c5e9b6d122a56462df420064eb

Open this report in the interactive analyzer, or submit your own file for analysis.