Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d589a6ea2bf03f0…

MALICIOUS

PDF

72.7 KB Created: 2021-09-18 20:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5cee1c85de74e20d96b84c6ffa5d6b7c SHA-1: 0faf942ee9f790bc55727ae500d7885e95beddaf SHA-256: 4d589a6ea2bf03f082d7fa3e699a5a1a2a556005f46f40e88ee4e1eb54f78eac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nceed.kr/pds/userfiles/files/34301835895.pdf In PDF document text
    • http://congtrinhnhaviet.vn/upload/files/56097053401.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/11528327025.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/fikunosexalogurarijomuza.pdfIn PDF document text
    • http://byecook.com/ckupload/files/zalisigefo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325f4f082b7---kokuminotumakanifowolu.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/kokelimiji.pdfIn PDF document text
    • http://lagrupacio.cat/file/jubuwudofaxewirudajed.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/19598675988.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/63990754635.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/23985684306.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66175945279.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/67a02bac641be67b571ba0aab0d80e3d/28541500126.pdfIn PDF document text
    • http://getem.eu/files/file/vokapukunijonomesazovolox.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161425fec5460b---46316268526.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/xepuzoxewulowiwef.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/68446566998.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/71801803128.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/21746275835.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/gokujuvupowopipiku.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/59202459935.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/33818173890.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/masanax.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/senubokefajavatipas.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8047d7394ec21cb74ce33c7e28861571/38701636806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=byron+cage+breathePDF 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_off0000bd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 15564 bytes
SHA-256: e7b6110e65c8507a00b6ac6ae97bbfa533d6f117ff23111ad0def946524b1fff
font_02_sfnt_off0000fd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD27 10512 bytes
SHA-256: 05f8e122b508906949ffaaa50c4338bbd235bf1ce005a43d539946847847da4b