Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f77d86c61feb0d8…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 06:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee4a28356c116eea7a714915008ab94a SHA-1: 6cf69f875c777b6f003400ab77fb77b60ee6527c SHA-256: 5f77d86c61feb0d881af100c86ab1ae6b5e279be1e36f257c6bf9df602f104c8
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier also flagged this PDF as malicious with high confidence. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b1403e09---zupumaxosusajilawewajezul.pdf In PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/e476ejah9onov8p8097p9v701s/45786776099.pdfIn PDF document text
    • http://canvangdientu.com/images/file/mixujejufazakuridagonagam.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/p9m0u55fcrf2p0o0llomkq5jr9/86988842811.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/26170868260.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7e4a76b0---45575049430.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/334541a03348b7917c642457fc09d839/9864899742.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/56659a7722a505e4259474fcfe912dc6/89254765497.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pg5hf9f95ar6hkcoaeo475amk7/gexezuvorexedebonisokowoz.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/kiguzobenivapit.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/fomakedoxowafivoximikipu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608afceae3473---lanapizimikolunisor.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/13522892924.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a22bd4855bef8258912d5e76b3953de3/nakup.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/95246494899.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/95fcc05c002740157f9c6466bdc321e4/84242421207.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/72175369962.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/76jk395h2cqqf2u8f21j9mjqbl/kivajex.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aa41d5f1b---86570247042.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/bepebok.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f990365ca---boxesopa.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/vevojebam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=all+50+state+drivers+licensesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10548 bytes
SHA-256: e25feed002e3d71d0f69fb7c54fb0a3fb49823e8b91f04edf050496ce5311e7d
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 18040 bytes
SHA-256: e9d7e152632e57158de57633050c347427b2c273c574d3306aef145de82ac565

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