Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d4825c772b3e303…

MALICIOUS

PDF

76.6 KB Created: 2021-07-06 22:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22d379eb9bf58349a099487ea2aee999 SHA-1: dedcddf619aa7f4b1e69b30ab77c0079daaffbd4 SHA-256: 3d4825c772b3e3033a56606932a00e52d77770b2d2b5e97971ca03d050891630
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080adb5b81a3---82826964881.pdf In PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2cjmnd21mnm34rgrnul570iv91/remevazuwojugewonamofe.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/42138971678.pdfIn PDF document text
    • http://zuche0551.com/upload/file/pelojizajudenovuvojegino.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871692cd31---kutifosojikufonalosisozu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/1051958193.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/86211492902.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90482c3266---sawidavataposezuta.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/juvudabinelolu.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/lilagopetepap.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/57626042705.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/15541030247.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8e28o8oqp0b8pf1lhjkflnqtba/gimas.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e6f2381b0213cad52679ce208f8b72bb/71160991532.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/skf4dmj2972toplphoaf06nn7t/94727794587.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2a89b907db1483c8900ffb160c0dc479/jovazilemijiwesakix.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987630c0f39---geradowuv.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b609f1736f0---piminivepav.pdfIn PDF document text
    • http://446888.top/userfiles/file/luzunafiwi.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/a5d532d9ac6b1089c731f40da63033dd/zokazuzunu.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/vevidibuteranolerigike.pdfIn PDF document text
    • http://18554080.com/userfiles/file/tafutomukokumolixib.pdfIn PDF document text
    • http://markone-tools.com/upload/files/63858329714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=front+end+cv+examplePDF 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_off0000cc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 10560 bytes
SHA-256: c5fcf38b5218e94bb43982fb6014de55baca4a67db12438640007d806e5494d9
font_02_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 15872 bytes
SHA-256: 243047afbb17dc3cc27bad7920c50f68b318435f373a80b6fabb8ca33f6c77de