Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa476920113afdc6…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 18:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6de565d4dc4d2c97fc396b44a960588 SHA-1: 7ddf922caceff89c63295fdd864f4a680e98451d SHA-256: fa476920113afdc6f6c2976926fb13eae3fe7502e36784140ff8498f51c2ff92
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://ikincielinmak.com/upload/ckfinder/files/39800876930.pdf In PDF document text
    • https://needletherapy.eu/upload/file/rajinudarafabapikuve.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/somizekujiputer.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-8-20/20210820173807895585.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/cdda32ad5d6c88f3288d8f0949aa3f07/29131970762.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613154ddd00cb---49308832509.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/36501325389.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/514aa63722d7dd9f329ab36e457aa513/nuxofinodur.pdfIn PDF document text
    • http://centrumbiznesurawicz.pl/userfiles/file/durage.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ua66g2fjuc42g8184gkrdu5c4u/zupomi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d0817327---4948597217.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d9ecca785b9873cf991a3f224e1d26a/9560359048.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d835eaca---40871042576.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47eeff02db---lakezifejatifonosena.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/kajevubotosajoz.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8eec94ecf310d28e78aac0b0be57461f/81756749743.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/76805880874.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xezojoj.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/aee2ak0eu9umjv30p0gp7ajudi/67334098148.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/27403059531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aquatica+orlando+map+2018+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_off0000de23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE23 11208 bytes
SHA-256: 14cc06cfc9f2ac807de2aa9721a948b4602b56a826b5a6d2d26f8a8c0f3fe157
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 19376 bytes
SHA-256: fe443abe59bd14310f83cf5ebe965a5643609936f2cdaf1c651e42076634f17a
font_02_sfnt_off00012a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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