Malicious PDF — malware analysis report

Static analysis result for SHA-256 2978e06618538795…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 23:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af19e687f1f3dada40b3761bc553257e SHA-1: f1979256e8801552c8c8ef8937d6bfc862d022da SHA-256: 2978e06618538795b52804dccf669a426e4f470ad7f355afd15c199c8eaddbf4
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://ccswcd.com/userfiles/file/90410783446.pdf In PDF document text
    • http://yilip.net/userData/board/file/76370139428.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2aa15b657f5567646bbb8afd4ae00297/68614700677.pdfIn PDF document text
    • https://menu2uplus.com/images/file/naberibatuvejafiv.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/banakebiwuzolibowup.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bc9366280787234273a65cd2fc155360/2602480573.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2930b24801---16431598279.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/b133930bb2842e1f0ca418b41112b387/27938238888.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/lijumerafeli.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/kikuwawiwazemido.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/kuxixo.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/19886176131.pdfIn PDF document text
    • https://bocrangsuthammy.vn/upload/files/44932210702.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/49213492399.pdfIn PDF document text
    • https://luminex.pl/upload/file/75190071479.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/05e4rpil094mfgpnheojvmpnl9/24175472821.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/73720659500.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161050eb26ae07---kosusakene.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/peniniwugipatarubuvukov.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vivak.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3c4ae5eb---18199647006.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/pozoralexerafutebezup.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vubifesemivuxoxakan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pergola+rafter+tail+template+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_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 17376 bytes
SHA-256: fb7de4d94fc41a9fb526bad35163872d84f335e64d317acef2d82f1bb260ddd9
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 10568 bytes
SHA-256: a01280faa069b902fba8605a3f4f9bfadab9ea7a5ad036626459dcdda0cd7c56
font_02_sfnt_off00012137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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