Malicious PDF — malware analysis report

Static analysis result for SHA-256 999bc72f16b02485…

MALICIOUS

PDF

162.0 KB Created: 2021-07-16 12:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 381c6b92e2bf22e89abbba8e004729aa SHA-1: d63c68764e805e54be38bb1d7f0d99a76afb4409 SHA-256: 999bc72f16b0248567828ce85d84e7c1d581632bf7982e2b8b043ffac8dce741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest an attempt to distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0220f0e21a28434b06e021389ff867af/meliv.pdf In PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/6c6d30bfa3d191676efbf6c23e9d7ad2/4294975262.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4dlio90rpck3am37oja277u5sa/zapezitasezerexibalenoju.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d116a3d14---kijowafo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df09cb2ca48---nebuzido.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/535c5f357c96101132e7e5464e446571/xozosumasajepe.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d4704548b1e184b0cf363b18b81b24d/desedulojugopofoviwuwunev.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16073219c37698---68736364174.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf47a3297---sigiwiwegasetexesafi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160957ac2e346f---kafosazigujemejonasibeb.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gorikuge.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/tugidixamemajejo.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/lusamepeza.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/82382138041.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14aab0a80---12137869805.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/kidinuxilijewewewimizol.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/4413873152.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3f743d36d9cd7054825af8f762c45855/kowixo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/44ea834bf08c2a667ac795a213de79e8/69545144438.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/p090u5cica59jks2fh0oq8tpte/fodaxexowotebeboso.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e6d8fdb3---dokage.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac7cebbb6a---9014386766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=everything+is+going+to+be+alright+rockabye+lyricsPDF 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_off000215dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215DD 19632 bytes
SHA-256: 68f2a81fa0297858dec4f25a3abd4a593ff7d44b8655830bcd61ad20d6f8ce49
font_01_sfnt_off00024883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24883 10904 bytes
SHA-256: 77a874ecfeef9aed2cfb7c1d6bbda11c28f0e39986c6c90e3c0847fe85f33b32
font_02_sfnt_off000261ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x261BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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