Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e03328e46b63772…

MALICIOUS

PDF

95.5 KB Created: 2021-06-29 16:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 314688080a571f893a1f64b5ce7724b8 SHA-1: 0be9d0ca374f47d09202066f7f00295bc4579a63 SHA-256: 4e03328e46b63772c668ef86929edf44b092c08af398413c37fd6acb5b1f8bdb
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating it's designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://nomylo.ru/uplcv?utm_term=tommy+the+hitman+hearns PDF link annotation
    • https://flardochform.se/userfiles/file/57916488957.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/zajuzulepujawu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/82fccbua0u89snqrin31h2j0d8/64114738177.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/mukonakebefikotosogim.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/biwekopesukusevosekago.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/lerodaxudapukonoresu.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/relovaferapizofesoge.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/wutanud.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/30d527cf152713860378739c50d4c909/1475947666.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fe85eff45456cc1e38adda47b3a3578/81395757035.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a775ce22463---mamumopokasosi.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/jiriwukofesisinenukese.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0fe785c73---lukisinopinadowo.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/rajogunokezedifowoz.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3763f3039b6436dfaf7a984060e75b60/86966952775.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/joguxosatema.pdfIn PDF document text
    • https://daismene.it/file/69916467871.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce5c615ec---jaselowoxote.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/18352833057.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160761138af568---sanogegijabup.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/xagokegekateken.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/9219804957.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/39243613262.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a57bbbf7a---foveponuxasujukilepik.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_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6E 17772 bytes
SHA-256: b95aaf9a73e1d629337ac0fa7ae9e552ba5f2836d9c02c227cc5f0e8de618026
font_02_sfnt_off0001596d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596D 10404 bytes
SHA-256: 3c64f2927b2f7350d98f670480f0d6e5c558039ab05ac7e7bec88cc0a6c930f2

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