Malicious PDF — malware analysis report

Static analysis result for SHA-256 485138183815853c…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 21:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd58baed9c0607e905e088c68d9fa7d4 SHA-1: 16752e8e1c2a87c43b5900637027b54b864efa3f SHA-256: 485138183815853c05f1f66d6b0eceea274552ed89bef75decabb609cab1e844
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. These links are likely intended to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/45cef2830a3ba17843fbacbc1019967b/48194373179.pdf In PDF document text
    • http://landia-print.com/pdir/file/99506612270.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/t04lr68mri7fuugaqqsjau7a61/44874076866.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/xopizibaxowovej.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e3c98bb58---14617385453.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/027bbe84f459429a7bcce588e57ba466/letim.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/82794403752.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/9278831106.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xerejomometevofom.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/tidomajonozuk.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abdfeaea257---95863784078.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/67726080173.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/jebigumaxojelila.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1626355170.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40edf2322b---44066821785.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/15481189214.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/51c0e0315ebacc3133366ffdb1661d92/fujufibogigudova.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/juravuvajugonetemifudonub.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/vepoxe.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/29a5af60dfc358e8e1dda2a254f29fc8/fefoguruxefab.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c1b79043c---nonozaxu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0022de55f---kuwedajefikafades.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/2431923635.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=guru+charitra+parayan+marathi+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_off0000b1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E0 10672 bytes
SHA-256: 5299b8c076bcdb6d048475948f85fda4a4914eef68d8ffc96082be8f160dd4e4
font_01_sfnt_off0000ca22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA22 14920 bytes
SHA-256: 5fc75c624cdd3d280dfcdb470583983f832b985e918ca31a70695de3444138f1
font_02_sfnt_off0000f02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1