Malicious PDF — malware analysis report

Static analysis result for SHA-256 56eb7318cf701b5c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 22:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8d1490ca1c3fc4a53d96477b1907b0b6 SHA-1: 2eb9cbf1096044248ef8971aa26b0281504a2397 SHA-256: 56eb7318cf701b5c4a7eddca2fd0e061dd77c5ffa5bd4d25a2fc08d6ee805962
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and several heuristics identified the PDF as a link farm. The document contains numerous URLs pointing to potentially compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the presence of multiple external links is the primary indicator of malicious intent.

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 http://samocvet.org/foto/ck/files/47919811793.pdf In PDF document text
    • http://professional-tuner.at/uploaded/file/48397197013.pdfIn PDF document text
    • http://exima.kr/userData/board/file/kezixitaboxen.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/50194325689.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614b123787c31---vusixumesotidoxiz.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/9937689559.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/jowanuzipaw.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/35253788037.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/81754354187.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/zuxedizusibed.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/xagarizazujusegelapiw.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/71515912993.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/2520751181.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/mikag.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/8784065463.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133c035723a4---xodegewiluvivafasenuk.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/lalop.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fe6c5e2a8ca81cc4fa961c118aa24aef/lubotefimibabumawuwara.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/sujijizozejajuwexexij.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/kunebubap.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/32344427122.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142da3a1c24a---28002774308.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/luwiwezowopezu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/06d58007f5a1968a2ab0e2667b2590c3/79815408990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=top+followers+instagram+apkPDF 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_off0000b060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB060 10844 bytes
SHA-256: 08e62c693667f91f97aaa687cc4fc864c6dd20cdc2d712801a22a29d924bb662
font_01_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 16092 bytes
SHA-256: fc4f2beb3f0165b67434eb49301bf8ac05c8ac8ad6c7bb68dbd52866d97ac9e1
font_02_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1