Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f1c67a6b870b94…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 05:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6bdd648ea8d39e69d662e1dcb927d8bb SHA-1: f94011597945e2c23d2588ddce968dcba2fbbfed SHA-256: 67f1c67a6b870b94020abff0e80d1f71115ddf1448dbfc89dfa40d9f88dbbab9
204 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and multiple external links, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document's content likely instructs the user to install or connect with a remote support tool, a common social engineering tactic. The embedded JavaScript and external links suggest the PDF is designed to download and execute a second-stage payload, likely a trojan as indicated by ClamAV.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://drafthe.ru/uplcv?utm_term=how+to+share+tablet+screen+with+tv PDF link annotation
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/7447475753.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/41568289616.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/47685864403.pdfIn PDF document text
    • http://arsvet.ru/img/upload/27007795442.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/90405307927.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/gojobinosebe.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/vepidan.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/nizodatoxa.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/6510217450.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/zitinomaved.pdfIn PDF document text
    • http://mdtrend.hu/files/file/xagaripuwarezubo.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/jonekedefiwadiruregomobe.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mivilegodoviwolekifuzu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492ed6c40ba---zojozefe.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f11d087acb---78547402932.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2d24b6ed1---bidul.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/94518567150.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/dugiwurodajenadiruwuni.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xolafunakezekupijukedozo.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/zabafuzatobokutar.pdfIn PDF document text
    • http://herve-coiffure.ci/files/46360638772.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/ditoxekubasap.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/mofalivolafa.pdfIn PDF document text
    • http://nessium.net/userfiles/file/10403159665.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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 10608 bytes
SHA-256: c426501a282765e92eb49192dd7d2e7fed7e7ca7a92363e807e40654d446d5eb
font_01_sfnt_off0000ec34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17548 bytes
SHA-256: 52adebdb897ac4fa404c3aeee5befc5ca32cdd83d6828e4da7590497fa569bda

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