Malicious PDF — malware analysis report

Static analysis result for SHA-256 894415ceb18675e0…

MALICIOUS

PDF

78.9 KB Created: 2021-07-01 18:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 52c205d2a8994e1ef3526646af8bdd6d SHA-1: 70b3d4f33e86a1e4e98bd2a3d2e2119c981d16fe SHA-256: 894415ceb18675e019787f314e806e0ecbe871584b034abd5f90b7bd09ef4cfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These sites, in turn, host other PDF files, suggesting a multi-stage attack designed to distribute phishing content or further malware. The presence of multiple distinct compromised hosts indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6ebdaebfe6db34aa9ba619d9c641cd89/jifitetusaf.pdf In PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bfaf406c0---sutubakolinefipapibufen.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be2a214e2---digikigebabivizefefud.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/94818c59feb6538f54c88a161bb9af9c/24509329046.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c832e17df---rosebugilupafekeruruj.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1836189fa8---mupukexaribal.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/439b73d6e5e870044f5fb3127615e6e5/99825536712.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/t42qg169lkr2660b64cokon7dv/bepuxatativatatokusiva.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/4045b2966932c19794283794c4eed321/fibudupejiwawatokugu.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/19997673264.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607005a10d0b5---68351112615.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e4e22932c4670415646c45ca1f8748cd/gexukobaka.pdfIn PDF document text
    • https://people11people.com/uploads/File/10221409887.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b81943665---tasopexajuputapetejes.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/94001792302.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/fifigumato.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f1169e889---56413766830.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/60e2c313417efe25b5f12ee2511b79bd/rogowuzojus.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759db755c31---32135744602.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607e21290a46f---44310974637.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5df2f19b02---10714774057.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/vidinuxovoga.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/30272497212.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5703f494---patadarisedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=km+to+miles+speed+conversion+calculatorPDF 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_off0000cf8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10832 bytes
SHA-256: 9dadd138f840516ddaf6c7ec4fc58cd70b291ce0a095b8fa4d5d2945750381dc
font_02_sfnt_off0001009b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 17304 bytes
SHA-256: 04cca76b46e4cc3435533d62806da34b58a2f75af9b77df8be65ce93200af36f

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