Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2734e614e8136b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 10:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a2945dcd49399244851761b9f543cc54 SHA-1: 60ffca691810769343aa94bf12fa181b49c8fe16 SHA-256: ba2734e614e8136b1f31e1e2e0cf3fbd6ac4347bbefac078f3980184849560b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting. The ML classifier strongly indicates maliciousness. The primary function appears to be acting as a link farm, directing users to external resources that could host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kede.org/userfiles/file/rerowazotajezujudirote.pdf In PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/43361688581.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/32249542505.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/lifunokuwalozugagafa.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/63247448650.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109061327034908.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/78762759865.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/pixexuziviwofesanam.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/75333578311.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/12133169687.pdfIn PDF document text
    • http://paradoxine.com/upload/files/27651065018.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dbbb148bd4---26451207729.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/xowizenelixonimibebexul.pdfIn PDF document text
    • http://vuason.vn/upload/files/tiruzonexikepiwiji.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/6172810315.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94244377549.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/5782109423.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/2629537841.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/nudulu.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/muxijejuse.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/gijoreder.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b523c813f3---boleduraludozazagenar.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/9b209c6c02b3b195d3c3d7a6da974fb9/78958291391.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148ad4c0eda5---52119602078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=revolution+of+the+daleks+putlockersPDF 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 16392 bytes
SHA-256: 9570c39b5f04bed0ba8f4eb0490640f1e5ff6fc372644f674cb717a6840a0be5
font_01_sfnt_off0000daaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 11020 bytes
SHA-256: 69d618e5deb1255e2b1a5173bbe065bb8c84a08ba4b832b9524f6c6c2bd2f633
font_02_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1