Malicious PDF — malware analysis report

Static analysis result for SHA-256 4276724480777f2b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 15:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 26da6f741f3a4ba866d0b9724d3c4f16 SHA-1: 967796cdbe980019d839c69469ee59c31000b927 SHA-256: 4276724480777f2b9070be9677da0f362ffd26fcd8f4ae6b9c058ce6341d7a16
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm structure is a common tactic for phishing or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=hd+android+gaming PDF link annotation
    • https://futurefacesmiami.com/uploads/file/66755172668.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/xesinimekofedosoreve.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xegagosudub.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zipivuwijipud.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/nelosuzotikudusikirufugaz.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133d45e1d76d---vazexavebuxafuge.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-3/20210903050113807574.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/relisonemamusupixakonaz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f3427932---fisemisozovinoraridawoke.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/25afea1715aef4613bf750f1ac04ae18/ratapugapaderusojifuwu.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/97923297055.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/68367847535.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/581495836.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/voxel.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/8487776936.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/xofibufinexujeripivamapux.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/9835180021.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/witabupuxoxabupuwakepa.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/83934638404.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/vejol.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/34137419514.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/97812545043.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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 10136 bytes
SHA-256: f8887e914f9f2e6bc1f12bcdc6e6243302fbbd16e95fe41fdf8e42a3061b4964
font_01_sfnt_off0001032c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032C 17172 bytes
SHA-256: 10710eb5a786922fa37446e45cba5a19102b65505efddb1e2a12490979979c72
font_02_sfnt_off00012f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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