Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e052b2107f4bd81…

MALICIOUS

PDF

79.6 KB Created: 2021-09-16 22:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d96ea490cb3998fcc4cf30493b47695d SHA-1: 4e43fb3e601184873f042cea57abcb4705a52419 SHA-256: 3e052b2107f4bd81d8be5fc6fd3302b80a262f62bfc2a9c61ec86ce5aee3aa33
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS uploads and disposable hosting. The presence of a 'download button' lure further suggests a malicious workflow. While no scripts were directly extracted, the PDF structure and linked URLs indicate an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=redmi+9+live+wallpaper PDF link annotation
    • http://gocep.org/data/userfiles/files/tiwesajefugen.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/67737303969.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/1708248640.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/vimesi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/jimivuriredunebefamufu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/88895470903.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/def612450d41ae9b526096ac4b8ee2b4/40939468651.pdfIn PDF document text
    • https://ayurmitra.com/files/file/49181178091.pdfIn PDF document text
    • http://gaudi.tw/upload/files/60633846820.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/juxujutuba.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348f1d9740b---jasalogev.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/88879752524.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902105425.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/10484239916.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/19909310526.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vfttefj28c14dhvgecei9g9m47/66364797288.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/99687187366.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/75387227096.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/n42nbq70ueaupvte767n1n2fu8/munigowuvisu.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/83497289203.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/27247226182.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/37545925046.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///15700946802.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/zuloxotefovivoxuxilaput.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_off0000d247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 18176 bytes
SHA-256: f45d2357e1b08d6eb97a576a5867718de111a7fbf80b5887f7ccd401173eecd1
font_01_sfnt_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11940 10428 bytes
SHA-256: c83fb1583c3cb49dc5b5512a836bca86e7a12f5d59aa6fdc5c33fcfb139cba04

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