Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac5bbb563e58540a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-20 19:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c51c0765904d02fc469b41d886cfc471 SHA-1: e8ed5614f574b3e870479b62d24ae8321e1162bd SHA-256: ac5bbb563e58540aaa6cd4addbc8d0f435c6f5d6c7e5007833552230bb0254a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and a link farm suggests the document's primary purpose is to direct users to malicious or compromised external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://iva-vietnam.com/userfiles/file/kefugulobibevijipowurog.pdf In PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97c50d61a---54982369759.pdfIn PDF document text
    • http://odumakus.com/uploads/files/jawuso.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7a7a20ae1398a169061ee0fc9b147c9a/99548337215.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/nj4vppht71u4o2396vthrdq849/45960951387.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903eab8a9b7---satawogeg.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/vafadi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abaac0897c7---88365976925.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/mufoladinapewizu.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d333835617---telebote.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd9c7772e4---migusirewosometolili.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/43584592752.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/21839108508.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b9ab4ba2---3596516259.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ffda6bdca807ff46a6dbbcafb0986a1f/65837985738.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160779c299556e---tobikogebowuwaxujen.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6eb92f36331a8da63a02903761dab5ea/tinoxupotufofulogajo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/33167610101.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5358cf4ea96233de3dfdb83ebe441c25/viluxapivori.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/bapubigazajopuludu.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/36003493648.pdfIn PDF document text
    • http://kalikraft.com/images/file/jalekanelokebe.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/6535692376.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/59200862284.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/6muhie6blo9kfo7vti8dnc53ii/janovakutisawilije.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/864f199eaffcd6aac6b81f16f60ab527/24072623134.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1fdae63ddaaa23b9baaec7ca89f5dabb/67724248884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+stop+and+stop+limitPDF 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_off0000f28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 10420 bytes
SHA-256: a6054c0dfd06b4da78854a817237098cc4bc64f759404d2280aace3128937b2b
font_02_sfnt_off00012206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 17376 bytes
SHA-256: 74b20a03968181c2d3e55a8ef06d4a55f88a5c167e6bdce9e67ac879dee2d62f

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