Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6238feb40015c2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 09:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ebd6777f94f0d33096c7f7c83d3eabfa SHA-1: f2a40b717873c0f2bc2e325a4c55a265b3b9c4be SHA-256: 6a6238feb40015c251713fdbf54f4adf840f5233dd1bd5668c3854b4b71ade8e
96 Risk Score

Malware Insights

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

The ML classifier and heuristics indicate this PDF is malicious, functioning as a link farm. It directs users to multiple URLs, many hosted on compromised CMS platforms, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://mashura.co/userfiles/files/zugedevigo.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075b67b3688e---2021436655.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wutudenumojafo.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/158f18cc33980e40d997bbb4e7b448f8/35349336162.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/33791574096.pdfIn PDF document text
    • http://firegallery.ru/img/upload/23170046380.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2pgjhcrfomm93kdvugc17ihb85/52675124078.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090727fa6318---12327305693.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/4ie8qehmotc21hv8ktcctm67q7/66836188245.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4ecfd61216654de3ee201f18c6f79eeb/76177761672.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/vuvokelomuz.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160886b6fbb843---lepamixarumexarovatesam.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d25d21ec1---99603218373.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1d834927---vunamevulamatugew.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/tunovixijoseta.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbfedad8dc---xegevagizilegamajima.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c975d70ac75---66187010387.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/zejifajutilisudep.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/tediburakokusupe.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/wafovemuk.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3ba422b8---wekad.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/tojidezoxiniduz.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/c57d8075ca4f956ac6b44ca50d99b799/tudaruvaze.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921e2db1219---vazozenifoxiwat.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/4ebb40443e0481d031a3f04f41be7cfc/tuwizewewemosebawexidulel.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/sokoraforifutenepo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nememuxozisezepunevoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=renaissance+prose+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_off0000e36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 10516 bytes
SHA-256: addcaf12364582b68f0bec7a70ce058b6dba9907bc21f8ff362e632b0c1a8368
font_02_sfnt_off0001138a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 17356 bytes
SHA-256: eb94c2a9c7d2b23a546ffc4a8851517a5e664387960bfef4c88c497036b2cc10

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