Malicious PDF — malware analysis report

Static analysis result for SHA-256 caad7afe7fed02ec…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 14:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ea09f589b772d9880b780596fea9823 SHA-1: 4161de14e471476465251cc5732a78a67a27bbeb SHA-256: caad7afe7fed02ec9e16e78fa27dd509ab623c100e6c36e18acb91b9177d9ec0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for malicious PDFs. It also features a link farm pointing to various URLs, some of which are hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://mea-travel.pl/userfiles/file/47031243169.pdf In PDF document text
    • http://fujavietnam.com/images/Download/jarovawajafiguz.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/84997480377.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/17104894356.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/90744133692.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/76131930939.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/88060476099.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/mijafuwap.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c2e04080525120ae09e683d0a733cbb0/96747030054.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/mogadef.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/tubatosapixikuzusi.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/vudemepa.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/96124194009.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/likobitafu.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/takebegunibikab.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/ruwomusetedevu.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/rejuderaxonewez.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/42rr3dq1194fnsrdlugevcf7vg/20797722714.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/wezapugu.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5ae172c28---61050052991.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438e3204b6d---bopozolojebikok.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/baravewoxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=tubemate+free+downloadPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 19352 bytes
SHA-256: 04b25af557c22a3c1d08293ced620eb64789e9858bca0002ddfe5136e7708659
font_01_sfnt_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 10544 bytes
SHA-256: b25e09f8b90cfa6e67c918da28f445d82ef0c99c3d2d3d03e1234a6df1507753
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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