Malicious PDF — malware analysis report

Static analysis result for SHA-256 585b76e629fb56c7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 14:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 385dd9827468789277c2182d56528d51 SHA-1: ac5582972dc39660675143dbddbb786eaa18e5bc SHA-256: 585b76e629fb56c7c6fb82fa9666955666ecc9b22edd89e93f8871c57fe28213
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm used for redirection. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's intent is to trick the user into downloading a password-protected archive, likely to conceal a malicious payload from initial security checks. The ML classifier strongly supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=como+ver+la+clave+de+mi+wifi+en+android+sin+root PDF link annotation
    • https://luatsuavina.com/userfiles/file/16694012503.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/81195203473.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/16514717230.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/fowowijovodega.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/kemabifezopavexese.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/4139669935.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/9912549769.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/10232797091.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xunevo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/69023062659676284c99a3db8c6dd2e9/80209357196.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/70780762327.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/netoviwe.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/91191257301.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/70627550251.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/gubox.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331bb6175e1---mixejuxadurovixa.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/buwexugaxofuxijoma.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b40ed1e6df---91409583283.pdfIn PDF document text
    • http://scro.ru/pic/file/voruliburotuki.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/ritatugidopadugakune.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/goruvigibuvov.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/26720046897.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/puwubedejipabidipurew.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/fodezijasoseluvan.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_off0000d244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD244 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 10820 bytes
SHA-256: 3cb114b6ac07baf8d66503fa4c761f8fe38ae69d6b42b06d4d91ce78da2eb8e7
font_02_sfnt_off00010361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10361 18640 bytes
SHA-256: d077fab6f74529b83127ba15c5a997370453deb389a4ac42f64b017b8e503fe6

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