Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf1f65bbbbfe50d…

MALICIOUS

PDF

81.0 KB Created: 2021-10-06 11:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8839dd15332c001c06e3b280205b897c SHA-1: 3b3ca0e86d5b63dccd5e748e5bf7d4947ed4f6ba SHA-256: 5bf1f65bbbbfe50d8e5eefc1e32bfdf33f0c685429fa62aed1f7de7009643d1d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials. The embedded JavaScript is likely responsible for initiating the download or redirect process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=oracle+pdf+import+extension+download PDF link annotation
    • http://savitaco.com/uploads/images/files/43509968459.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/82474412383.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea4c2532a3---silul.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324dc676bf5---45583154670.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/25870798377.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615978e6f2fc6---28235233558.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/sosofekedaladivikofu.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/80674798254.pdfIn PDF document text
    • http://klpa.net/userData/board/file/27105958003.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/79114708244.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/zuvux.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/guzela.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/b038f2efbaafe134497deb956d38cb43/91675915277.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/panuk.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/fapedeka.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ddb962ee0---mefekiletew.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/magaxawibojazorapanixevam.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2ec55ed0---49125531182.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/fupigibidenixe.pdfIn PDF document text
    • https://5uempat.com/contents/files/12511063124.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3gr9hg43er584rn5bso4ot6nsb/xuritosoxobidi.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/15479466270.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_off0000d264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 19016 bytes
SHA-256: 2801af6c52d38be81ae875af89061f75cd923befd7626ecbe2bb6661e941f54f
font_01_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 10992 bytes
SHA-256: e1d1222ffaffa1ca50790f08ec6fefb9d116377d477ed8fa4431d308521633a9
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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