Malicious PDF — malware analysis report

Static analysis result for SHA-256 baee26d2bcdec68a…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 21:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2b693630fdc56bfa98d60d2c93082a9 SHA-1: ed9647dd3803ee56183d7e71a2c91a4f010d019a SHA-256: baee26d2bcdec68aaeabc8eaa6024c3c899a55b6ac93ba9c20235fe2c7edf90e
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which are part of a link farm. Some of these links point to compromised WordPress upload directories, suggesting an attempt to host malicious files. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dedanskecasinoer.dk/userfiles/file/38169777412.pdf In PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/12803194665.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/28779294280.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d2696a2f---laperofutojefavixuxozale.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/telovukebemaxuli.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62876af96---pudijase.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/63619601839.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/12723512350.pdfIn PDF document text
    • http://synhbio.com/upload/files/97300706958.pdfIn PDF document text
    • https://stvorki.ru/files/file/30185667107.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/82992044104.pdfIn PDF document text
    • http://mp-journal.com/media/file/27941554180.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/91699296580.pdfIn PDF document text
    • https://jurad.eu/files/file/8530144346.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/18673063229.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/95177976541.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210917175838.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/binofupo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ff9891181354c653ab10605807e2c367/wosixizufi.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/8822762297.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b08488ebbf---kipuvametol.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/vixivazewune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+miracast+for+androidPDF 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 10592 bytes
SHA-256: 56c1338308597c5133c49ac8d7e3d98901395cb66bd40d1c953a3e427857d00e
font_01_sfnt_off0000ee46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE46 17524 bytes
SHA-256: 975ecdedf5302504fe469b5214fcb4535288c2fd84e52f19ee5c3c20c4fc8b74
font_02_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1