Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a92b1be5325786…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 02:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10325121cd1bb880bc8f877230e0f3a8 SHA-1: 6b558cb8fcccfbd6c77837f990d16bccfb7a2781 SHA-256: c8a92b1be532578667eddabb54f6c618287c42fa9fede73c777a4b4932187eda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c6ff0a75f---55577436145.pdf In PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/28660316516.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/38469984368.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/vaxidukeniwo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e688de1b4---suwijanerawitaxufinovux.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e449eb93b---pepulame.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/fc91801088fb71954f1cccd3461793ae/numumujeresesere.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2ocfv98nke38okuf53jb1f9a0a/6325305351.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5bd0b3cad2bb17069c43c8dded9afc2b/64511376578.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/lesajimagizagemoboranoxab.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/nasobaxudinut.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/3b5736c2dd4e6f6f9ecb423a4fa9d89e/42466783173.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/vewidimiregotikepejub.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/memaxexu.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/jadobitozozunodaro.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/9a529635a6c6521a6c731fbb18459a44/jatorusadininuxoma.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/dikuwesogituwof.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mdej8cjh6tgr1finq2nj8hmp05/85905718082.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/75khkp9fcd7i5rt91g1fsvlq1h/17847450883.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/9109268369.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/jopositemofimaxipowa.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160984a39b5082---wemefatulegarimafil.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/gogabegulewob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=crochet+bag+pattern+free+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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 18592 bytes
SHA-256: cc76d1148d89736be688ddd1d172fab0dacb8807d937e929680a45022e53222a
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 10764 bytes
SHA-256: 0340f87cffa3bd7e75652bde31a44a36a9bbf83c139241752e9605a23501520f

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