Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b33e8706b13912…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 08:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff1e2a1c3f64ca4505dbbb6ae462bbd2 SHA-1: 545290b7463c95fa7a604e755b7358b2ebe52cb5 SHA-256: e3b33e8706b13912aecbe7adb82a2add4ffd3fabba479e1899387584bf8ade2d
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 potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://kirilmazbardak.com/userfiles/file/bosajifixuzikonetiwozu.pdf In PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/84882872676.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6a610bf97---jafavoramefexapomugezured.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/rinomoporabuwisagutev.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/pujukolutiro.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc944d5db6---jawopugotup.pdfIn PDF document text
    • http://sartor.ru/upload/files/26712151745.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/62842815404.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133daa95d718---21253579492.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/86258753111.pdfIn PDF document text
    • http://huntland.hu/upload/file/42299054282.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161306c2daf6fb---39945010714.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/8342607464.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/69030227682.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/40335452430.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/rujasadoguwad.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/62242802615.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/jefajakez.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/momavupopobobesig.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/50935064307.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1649ecbc---sesenufupilutejenuxo.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/50272812616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+do+i+put+music+on+my+android+tabletPDF 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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 17112 bytes
SHA-256: b50f71fc4f659da7413ca615bd52085c679cd75ca2f007afdba157920bc96906
font_01_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11108 bytes
SHA-256: a291e2c7f57d58744c2f47710bd565f14650636cb383ab73b4d0c6d6836b9ca6
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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