Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4210196ef77d2b5…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 12:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d31ad345cbde7ab7625caa05a377539b SHA-1: 0c549082bc38956413bbaa46f09e555894673496 SHA-256: b4210196ef77d2b597152627cf62a87d838ebe48154b714b24f9884c7f9836a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=harry+potter+goblet+of+fire+harry
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a99652113f4a0ae86448b681c5491fe8/bofuvasefebolagemawuwu.pdf
    • http://huntland.hu/upload/file/36217226880.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/34ml0m6dqmhm1jtlq8c3r9ebdm/xekiwixavuvisu.pdf
    • https://fablab808.com/nbloom/fckuploads/file/68917233097.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/msfllsouomlbmsp4kmu2g9r10d/xizegigiruxevumuje.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913ec699851---rusomisewage.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084544905ab5---xudasujanomerawefoxebawiz.pdf
    • https://pima-alarms.rs/slicice/file/81817438623.pdf
    • https://securitydm.com/slicice/file/puresuzik.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/pasol.pdf
    • http://bitite.lv/media/txt/122/file/87746891518.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28d3745c4---kumekonaxetetizabuxop.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/2p80htjfgfsqiqv42t5799t409/20275961491.pdf
    • http://aaaexpressac.com/userfiles/file/rutuxejewe.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/36357797489.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c648261eb4472a6c553cdd49d80a68fe/wuxemerugulekozamapideli.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/dee9d2f44ce80a732aa2ee8170f6be9b/gafagagazuludowogufovezi.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/38312691000.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e21107e30---vakenedajugufos.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080082fbb8---78313843187.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b385755e99---57635862018.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b43518cc8f1---dotidubamajegiwolij.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/1a7hticstpn6omd3ut0vn2mf20/60374361739.pdf
    • http://dachastyle.com/userfiles/file/kuzokebelomovutaxujefi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef50.bin
99888dfba2215920e802addaed4af5054a528034e3837cab180b021f68319e2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 17396 bytes
font_01_sfnt_off00011c9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 16792 bytes
font_02_sfnt_off000134b2.bin
b4a629a094a332179ab00215c60c64bd66f4ac65fe9b06f7812a5716a6b8ae37
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B2 10612 bytes