Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d890733d39cb8c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-07 19:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16ffd6c9081d102d337a249b0ce1307d SHA-1: 7d6953d3c5c0e3ccc8cb109743e0db9880387e49 SHA-256: 59d890733d39cb8cf061320c46ecf91cc41d0efda5aef47423924088fcd0dd09
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://ahxxzx.com/userfiles/202105/file/14691336139.pdf In PDF document text
    • http://chokmanee.com/userfiles/file/ximejepejaxedorasibo.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/wufowuvi.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9badafe4d3b621032644fe31516bd513/rulovelixitosudobiwapu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160da589c6fdc2---43353745871.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/c3d1ab0b236f694a9fa73d1b5f30155e/sagud.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/31909278598.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/luvonemawubekeliz.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/83973586617.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/mojeva.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/90803656184.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/simonopedagedumi.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098be1594fa8---97727726269.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3503a930---tufubured.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/0762512df9f00094ebbe7f0650988a10/58004568475.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea33149fa6---wakapofanedef.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607acb6a03cef---13331881670.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pep1goatkgqs68hnbulofo950u/48619951450.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210625_AF14CC78CAC36D05.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/47659088574.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/16179d9aa888d86de958d391db7e0c6f/zoxuvekurafuwato.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9b26165ea6d811f42f2fad2b60f10565/72789055986.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/nezewevupunemiziburoluni.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/tiduwade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rotary+vehicle+lift+manualPDF 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_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 10760 bytes
SHA-256: 847e248f1971be13ff9211434274fba7a92d4c18b53a6b4fb4eec6c9a258bcaa
font_01_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13080 18944 bytes
SHA-256: e1c3576e57dfe8fd55ae4a07dae367304c082400bc6bc8b8c27173732e62dcdb