Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c5a47c5088ad7f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 07:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b5c7cb77ddd553376e62122f89d6110 SHA-1: 5d5ad2fc68684c2299072a2a94113f9883c9994e SHA-256: 82c5a47c5088ad7f586b6be0263c0741eed7a4847e0ed94a4c54d0405cb49848
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves leveraging these links to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b0bb6c8a---49614275596.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120610683fb0---74132608632.pdf
    • http://wami.cc/data/files/murapikesusek.pdf
    • https://expobar.vn/app/webroot/files/images/pages/files/61593267282.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/56334113255.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/5853a7da17b1d553609a39f49a7e14db/lozegilitow.pdf
    • https://alohasafaris.com/files/42953901412.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb12a737944---85821889216.pdf
    • http://risme.vn/files/47441336826.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/63967tl7j4gvpamhuipl39mg15/bigugedajadenelabakumukad.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6177974416---51704292388.pdf
    • http://infinivideo.hu/sites/infinivideo/files/xitegokigomamofedufuxam.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2404d34e44---22195003235.pdf
    • http://mt-filtration.com/uploaded/file/191630122060cdcbe9e9a3d.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0de7cba9d44d9132021fb492fc2ffae7/liluza.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c22b44574---40135885260.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/514493d0c9fa02b93a98afca6d9a9d1e/temevupeki.pdf
    • http://kopdesign.nl/userfiles/file/83270216790.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc62cd53683---tabegajozagedutugizenis.pdf
    • https://faresaldabbous.com/uploads/files/38239671021.pdf
    • http://immodraft.nrw/images/architekten_agentur_images_/file/8270776584.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97022180e5---20602558292.pdf
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/pifawanidokixikov.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c57f8078f---19912608628.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mecanismos+resistencia+bacteriana+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_off0000ce18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE18 16792 bytes
font_01_sfnt_off0000e62f.bin
8fedc1b66b2a098325d20224299114ec08faad22e771f956787e1d02b791c397
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 10868 bytes
font_02_sfnt_off0000ff0f.bin
6f5aca558834762fda1b79a38010206be2223492945061fa01dc396d6efe7c30
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 16740 bytes