Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ace3da95bed2acb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 10:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b62e57e64d7e75d2c9c4858c799ad6d8 SHA-1: 84344545b202a7ea77c3a53860d64886d2867ebd SHA-256: 1ace3da95bed2acb8c53bb58cc2c0512d32ee53019474fc6f75f70bceaf80d4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=android+pro+video+editor PDF link annotation
    • http://dealershop.es/camarasegovia/userfiles/file/guxinuwosoraguta.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd3a111ed---fesojori.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/juvozetoduranisotetepute.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6066fe47---62211531498.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/fewotagukunofajedud.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f6824087d---56500828573.pdfIn PDF document text
    • http://haphadoor.com/upload/files/famutanex.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/wududojujepaw.pdfIn PDF document text
    • http://foxhill101.com/userimages/56067744061.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161414627e2a4b---wuniba.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gipusuzulamijopukini.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/koxixurujar.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c73a670fc5---83608238490.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/gunejubomabudirup.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4a333719f6bc6dd07a51cadf12700cd7/kawuzagi.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/wobefiwerobupewalunawi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/80043002739.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090518114073499.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/nolutenaxujilod.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906231220.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/459f658641f8ea94a547442629ba0842/vaxukukez.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614194a3319f3---11408055152.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_off0000dc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC71 10056 bytes
SHA-256: dbca5ef76212a688c7a122167d95b670ba54b07c43b7ff9270a02a03997779fb
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 17868 bytes
SHA-256: b882d491d6f9bf7579ca502d36d1804ac3f309df434d15022d0cc2f0b1b8cc86
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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