Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a7d9bfae508478…

MALICIOUS

PDF

86.1 KB Created: 2021-06-30 01:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bdd97eba633297f492e11e404f135db8 SHA-1: 0f6a1e305c1b8cc867a371ebf507e853c0ef3884 SHA-256: b3a7d9bfae5084788a8459f0cbdbb9457181d4c00c86838448a815c624eefdc9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, aiming to deceive users into downloading malware or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a4613351ebf96de93e1535a56468ecc4/votukosagowa.pdf In PDF document text
    • http://atallmed.com/userfiles/files/11065031622.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/losumowupiruzeposowe.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/0d3f047bebed45ec08f4e83a8b021fe0/rubuzepivufotogunanejux.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098865ccb654---11746559378.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/vosegikowizaza.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/o5aq4f75qp3keu78iaja1blg52/61814291342.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/eu0konfmt3ilduufiuipb8c8h5/94103214296.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b3bc11ec---wizuzuzusewalejat.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/01fd8aeefa1d28ecca1b7b5846ce4e08/bimuwiruzisefulinokufiso.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff5d60065---72083483168.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6f89ce319d6723900b9dad8266f71382/33397761167.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba718ae1481fe85764a2c37c5481a374/20454066498.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af32ef3c57f---tadivenego.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/fcd46beef3ad182042760712b5ffe198/94517552283.pdfIn PDF document text
    • http://shopexpert.com/app/webroot/files/userfiles/files/78433673870.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/51781216056.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608522f37d233---78135237609.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a2f661e3dcf77da8d0d5957bcc70b74b/kejufemawujur.pdfIn PDF document text
    • http://mega.kz/media/upload/files/subapibup.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/5749028662.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/52247598734.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ad31c6cc4---57181145269.pdfIn PDF document text
    • https://amblamy.ee/upload/file/61763921413.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/65833597435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bet+on+sportsPDF 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_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 10000 bytes
SHA-256: d7d22c499362b8b41b447cf1cda5fa4682e88ac5ff38e79b582d08c6ff55cc5e
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 17760 bytes
SHA-256: 9ca6d48b2706c481ae4714ac6a72366189dcabafca75faa9f36bfa2aca4676f4
font_02_sfnt_off00013397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1