Malicious PDF — malware analysis report

Static analysis result for SHA-256 cabb5d8c6cbbe8ce…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 15:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5f0b56fd54d75fe90a04b5c84fcfd147 SHA-1: 160f66a3361ac69278585c4ec255b85f7ef15d5f SHA-256: cabb5d8c6cbbe8ce04f4ed04ececc8e3e012f4d5e992c6a423293afa180b1710
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/5279e55bb1709da9f4355c221ad45150/pozogipulidom.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607483febb895---62652717182.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a552d778af0---vegasu.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd4169c70e---54269426916.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f797cf49d18---mezexibuwulorasedafik.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-24/images/files/butobuguxuve.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491db88589---patitajawapu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/jagodapoka.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/66903493942.pdfIn PDF document text
    • http://museeducuir.org/upload/files/mulamomejotenukegibop.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/gc0npl1hpb32ov3ftgh7fd1ti7/95765245663.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/rikazine.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/regaxivorup.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/xaxokufulijamovazijuzosej.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/72736235714.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/pimeduvijekefub.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/230cab02e4fa572cbd7e1db7efc36b4b/53279145897.pdfIn PDF document text
    • https://ienter.bg/files/fudorelebopo.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/jobak.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102cd63be4c4---60142978818.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/72c24fa94f23722dc59193cdaf939e98/3844533197.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/dowulinala.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/o66jru0q3nujvdqtrcp73d07dr/zevazonuranobavipuvi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/fawefujidemi.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef51e09c1a---motuvezatowir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nosler+reloading+manual+7PDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/72159355246.pdfIn PDF document text
    • 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_off0000ca0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 19016 bytes
SHA-256: 62d274e3024e760f3f9f9135469fd7ede54f0e6ba73885f51886762a649601d1
font_01_sfnt_off0000fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9A 10620 bytes
SHA-256: da138582ec84d51421fa9f0eee2270e5ea5a63b7c858bbae79e2e95b743d2ec6
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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