Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cdfc3d303ed6a63…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 06:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7234bac153839b198bfc8231d0f0e91a SHA-1: 87877765486f0f0db8e3c51128fd19dc11ceb128 SHA-256: 7cdfc3d303ed6a63b8eff2cf1c3b40a8352aee978c9bbc02ddb0c4a46dfe3d99
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, and the presence of external URIs and compromised CMS upload links further supports this. The document's purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=psychology+research+paper+example
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/u2jbmnhjn6gvi36hc5n28bl1nb/jedexaxogakavufowazipeki.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/eb4078e1c5351db39800a16bb480ceae/86242797796.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3237b3c3c4e39c55a96b98f45592830e/35921180522.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/6fd72ae5f6ca6381f985329b32c5e24d/guwamixunazamusejelixijog.pdf
    • https://airflow-skateboards.com/upload/file/jinexebadiziwovo.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2493a8e7c---52051405686.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/lcc9718igtepk3iuo97gsf4afa/zakibamudoxoferukivatem.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/59538600967.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4efcdc747d---10521516048.pdf
    • http://notariocprietoa.com/notaria/documentos/files/30514683216.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f209944eb---26515811459.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/89222388419.pdf
    • http://travelport.pl/userfiles//file/89771936802.pdf
    • https://baatco.com/ckfinder/userfiles/files/23021669141.pdf
    • http://cuanhuaabshanquoc.vn/files/wulabikezafupujod.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a76f324ba59bdab7fb9bdf4e6d896cb0/kebamozi.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4c464a58---22412770589.pdf
    • https://marljivo.hr/userfiles/file/polawerenupu.pdf
    • http://autodilykanka.cz/cmsimple/images/file/47419902707.pdf
    • http://kibbkw.com/uploads/files/69321129565.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecc2694945---bomesunos.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/s728nb2rodfho4q2e716beuv9i/jonetibatikaki.pdf
    • http://erictex.com/ufiles/files/1272250032.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f617.bin
f3dd1bde58d00d19e4284eb9d1c820c426a3ba5cf87232c2684dd414707d4e4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 10744 bytes
font_01_sfnt_off00010eed.bin
45a953f438d9e7116b3f278ae92ca775b1d81f4f0bd188e9355f95677a68df22
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EED 16984 bytes
font_02_sfnt_off00013b5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5E 16792 bytes