Malicious PDF — malware analysis report

Static analysis result for SHA-256 a534e640c8288faa…

MALICIOUS

PDF

73.5 KB Created: 2021-10-01 13:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e94a3c2d0868bcf036e35b363a3b708b SHA-1: cc8bbb086d311c5c597ff15fc81bf82e59bb9b0d SHA-256: a534e640c8288faabc032e3ab0974c739f682cff656bef6ac9d791fe5dfbc10f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript stream, combined with the link farm, indicates an attempt to redirect users to malicious content. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=dr+fone+crack PDF link annotation
    • http://kammerchor-lindau.com/file/44006912345.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b2b4100910---milosurewu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rujafozusipikavuxem.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/92003163960.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/wifejowidanirobepel.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/fegitexowurod.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130563485cbc---tupitilelofixuxus.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/64590994864.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4e7sufo574ejo05v67gh23gk3n/timox.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/436843331.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/supuguzasawejokudune.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/mabuba.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/merivug.pdfIn PDF document text
    • https://ikomsolutions.com/admin/userfiles/file/xumadanajufuso.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/kutiziwomobezuvalo.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea0e7622c2---koxuboselazenuf.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/20700232749.pdfIn PDF document text
    • https://red-adlay.com/upload/files/30917896401.pdfIn PDF document text
    • https://keongracun.org/contents/files/zazimowuvop.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/wedaseru.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/zefetedasewuw.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210907122314.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/nupam.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/wipaxewinarupewo.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_off0000b933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB933 10016 bytes
SHA-256: 7645a601783c743f394bf16b92bed92b15a5d2e567197cb27e72e7fc8dda7fe3
font_01_sfnt_off0000cf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE798 19140 bytes
SHA-256: ebfb6a3e322522cbdc1a3cfee89de5187313e39af01d35d8025240cdc8204685

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