Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ab80f25fc74c62…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 06:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b1904ac0a09e2bb405d6008588e4477 SHA-1: 3fee0eb800a2318f834ecfd48c9b27c03d9a5867 SHA-256: 66ab80f25fc74c6279667cdbaf17f8a118a6812c4f4cac6307bb39071f75395b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to act as a link farm. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cf77d6bd4ed---1819509217.pdf In PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/soxegejawex.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5d8861c7---javabopazaxonijos.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082af0e620c8---sepetuwirabebiga.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/52809705682.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb8fc6949---vilegejejevuteguvewegoneb.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160868d56313d4---28211293392.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c20bdea60a5---42393535626.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/61395330220.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/56199590954.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/52283606201.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a924a5365---2321092349.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/dokajuvudukevilodoros.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/42999499647.pdfIn PDF document text
    • http://laduses.nl/image/file/15010780582.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/62373244939.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/vagazikaduj.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/33911052630.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/9bd7e7a9453ecc464c71355a60bb3405/vozogazomowa.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/xibivixodom.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/94632324974.pdfIn PDF document text
    • http://dermatologie-francophone.com/userfiles/file/39888633645.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2nmhptfeltmc8jjhf3eo5qqhj2/74246800821.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2046532854---53324448531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reign+enchiridion+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_off0000e3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DC 10472 bytes
SHA-256: a98849e5ec71cdb065dd9af33c175d0f7e57ad69a74433c7b2e559ee9406fa77
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 18184 bytes
SHA-256: 18213437feac3f9f52a57a6ff305e0ece6d94e2cd23359f7c88dd199654b84c4
font_02_sfnt_off00012b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1