Malicious PDF — malware analysis report

Static analysis result for SHA-256 a696f79b32f6a97e…

MALICIOUS

PDF

85.2 KB Created: 2021-07-13 10:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4aae40a43521498d3c994fe3b53b25ea SHA-1: 7a7184ba01d4ca65118201d0c09da13a1ab42559 SHA-256: a696f79b32f6a97e1539c8af1efc4c0b870ee0cfe0d0055baf48ca023bf4491c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by an ML classifier. It contains an embedded JavaScript stream and numerous URLs pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript indicates potential for further exploitation beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b053f3741f3---bopura.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608593b4d7291---kutusevezumoxatego.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16095d2c8414b8---romijaxofijenijifenus.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/rujiwukefapavavebuj.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/92584449828.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/26097782769.pdfIn PDF document text
    • http://effektfilm.de/files/file/84171104338.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf964f109c---jatizapapowos.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094232bea8a8---zenuseveme.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/15758910057.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/susuvazuxadojijazureko.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160776b671c4ec---8088304898.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/09fb8fc3c4c79bf393741bca7faee63c/wugajeguvanaluzit.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/nefiliganape.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6fa59a0b991fe740ebfbb4ad715ccdf8/19748012011.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/689e30c7d1c0fea74a211d0d01d1cdef/sizev.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/6928225306.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/1316113684.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be8fe54b0a0---79393655818.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/42657458271.pdfIn PDF document text
    • https://susta.vn/userfiles/file/kimapi.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/sawawivuraze.pdfIn PDF document text
    • https://unserbiokorb.ch/userfiles/file/xedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=bogey+meaning+in+golfPDF 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_off0000e9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DF 10356 bytes
SHA-256: b739e00e146002d452c4ea23e658e3085f6d5a432d2719e1fd745abe51c8c471
font_01_sfnt_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 17600 bytes
SHA-256: dff35be05d9996e49668c1244d3da35b8492b30c88ea719c6cb58d7da04ff73c
font_02_sfnt_off00012fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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