Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b05f9d806af424…

MALICIOUS

PDF

89.7 KB Created: 2021-09-08 18:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 16035d18616db1cb101a7134e9dc3454 SHA-1: c0f7a78fdb16988975fd07b22be4c9ce942f87c2 SHA-256: d6b05f9d806af424b901b0d8b4d40a720833f964e64811d0445faa9f5da298f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various PDF files hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ixiu-23.com/uploads/files/202109042243454460.pdf In PDF document text
    • https://nevisnews.com/userfiles/tukivul.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/28512465092.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c59e1d2a---taxazisajuxapepezu.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/fadodezalijawoj.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/33824271702.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382ca69d70e---39414241668.pdfIn PDF document text
    • https://777mto.com/contents/files/80405564997.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/14424724290.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/fiwomasisobibufalo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bb59c8cbc16f005ad9074b4f92d87577/wubikazidapesudiruf.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/60568975724.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/medosuporak.pdfIn PDF document text
    • http://pk.mo/userfiles/file/98703572871.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/18487658157.pdfIn PDF document text
    • http://dgkno.cn/upload/xenojopuzazirexuwurofijoj.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/45369168169.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/441v1gqc633rmndh7jieoa5orp/sozipijufinu.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/duxovuboxuxil.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/41793718300.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109051131546160.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/26712516564.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b27117562470b79403d0edd43b3f2c7e/fefefodiwezasuwuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=diagrama+de+pert+cpm+ejercicios+resueltos+pdfPDF link annotation
    • 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_off0000f09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09F 20812 bytes
SHA-256: 13b913850c67b46d0d167367dff11c3168cea28712c40d1115192529e075ae25
font_01_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED0 11088 bytes
SHA-256: ec8176f84062b80edc2d27f8777a6b197230d3fc33a5ca42fcdb71f33e9ee8b4

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