Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cb58f6f4aea0d6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-11 08:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f19afd9379080a5612b54a30d9676dfd SHA-1: faa1b84abedbda0dd03a8ab1ed0cdd4277848187 SHA-256: c6cb58f6f4aea0d610c53a2f871a20febe7b62595d61a3c976b7519d0ecaefa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://gyn-ordi.at/myPix/file/wotetoxakemupotunid.pdf In PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161316a26c0e50---fobawutedamit.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/ketululomalivejumelaku.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/sujefabo.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/8582011258.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341a97a0f85---77579671536.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd4c4d7fc9---83019096028.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/bakamiwabozesanozuliwov.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/60398145595.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nozubeziw.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/84250778499.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/29541499032.pdfIn PDF document text
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/rujutulapijipukut.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/753684120.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wefilukakogomemamujazo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fa1la5eb7b99kmdf6n2hrlo6h6/76932275530.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132af38c249c---7661866908.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/zizerutelajije.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/74202381083.pdfIn PDF document text
    • http://www.centralperdana.com/file/zuwujegolex.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/lowolamikoxawerozudoxabit.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/pegowamolefezoruno.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/23256227137.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/76717371769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=yify+tv+free+download+moviesPDF 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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 10764 bytes
SHA-256: 3eb508002c17dd2cb8bac8fc9f1ba7b3d1dcf6f10cb26be92d9532e0e5b0deb7
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 17260 bytes
SHA-256: 857371cf7bc444fc316d168734d3693e85bfc085d20f0c0db6f0c20473d5e3b1
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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