Malicious PDF — malware analysis report

Static analysis result for SHA-256 68768692cfa4c8e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 16:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 444c94d3bffbb930fd24292ee556c3e5 SHA-1: 66f76198a57abb9013d3ab8dabf506415a727968 SHA-256: 68768692cfa4c8e452c8deabe99964079c427f30364665d74b5b22429b51b8d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised WordPress sites, suggesting it's used to redirect users to malicious content. The primary attack pattern involves leveraging a PDF document as a lure, likely via spearphishing, to drive traffic to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=is+it+possible+to+screen+record+on+android PDF link annotation
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132658d9f997---lobewasifejobiraziwupisak.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/28105660019.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141319ac1156---sokopa.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gudezunamesofotuvenukuzo.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xefixujumimigaj.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/vavepusonewipikejarawovep.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/68472224432.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ecc759244bc56773b8882adbcf221cb1/degubesomofateziruxiwutag.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/17724707323.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/59389924288.pdfIn PDF document text
    • http://deltools.com/userfiles/file/virepasekixotanalogowawo.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/sujukejozevawipogebut.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/ninufikow.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/webezifisojagubejowu.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/68101315636.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/fusaterivusurew.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/44710221552.pdfIn PDF document text
    • http://uteambio.com/upload/files/31818292724.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/piwirem.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/27306603371.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/wavanod.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f81db9dbe---sidonoxapi.pdfIn PDF document text
    • http://meta-min.com/files/87736291798.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/kukumezuluro.pdfIn PDF document text
    • http://teraval.cz/res/file/73666028313.pdfIn PDF document text
    • 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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 17900 bytes
SHA-256: 821c295873ed49db2e59898bee0a1ebd104bebc9fe26c065a8bccf9b5204b10b
font_01_sfnt_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 10600 bytes
SHA-256: 4cd0bc5f70297d83a978dddd6c1b864bf9fb9fe4b7d8d6ca4ffc985b094251f8
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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