Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c847957a15989a…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 05:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39a4235dc3a9d8afc1a5e27b0566a946 SHA-1: cd21b3b73d1443c54d89dbe14dfcb93380f7ade9 SHA-256: 58c847957a15989ad260cc36ae366bd28b5369187e736168ec9b2fc8b0278510
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. These sites host other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to potentially compromised infrastructure supports this assessment. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9e1b9ec6---2901859071.pdf In PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/memasexumeraw.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ntgs7if2f1f91kr37uosutq8dk/gusexolivogufaxiva.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f81a27a2e---1841839420.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ov35lljk66amsppng0deabg2n/30714206382.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/43821047380.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084130fcdf00---93987222073.pdfIn PDF document text
    • https://agatanorek.com/files/file/82625455933.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5d5e506a74f9fdc6d153595813fae2a1/15604844233.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0a980d01---45627078358.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/vebusunotunalaw.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bdef9d55c---23218639969.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890c4db1c56---63485475906.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/sogufexujoju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b2d7c8a54---71931690778.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc926b40c---foveroj.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5e22d5fb3b99efdfd3d41b13e26008f8/mapifav.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/1395794119.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/93198779549.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c362d682---pabokinapivi.pdfIn PDF document text
    • https://ancoraeducacion.com/images/31302818815.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607156fe3081c---nasuzixodim.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/21418093111.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/wokunu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/h0tds3lesa9bom31213e64ppr6/damupepemegotegivi.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9372492148---fikufubusofizuzun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=all+types+of+genresPDF 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_off0000f2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CD 17612 bytes
SHA-256: cbe870449cfdb7397369e9ec015324f746ab9368e326f67804b9c04fb25a0194
font_01_sfnt_off00011ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF6 10376 bytes
SHA-256: 50c8752cf8e35f48493b4d85992475f40eb22011e5a1c3e3dc2412b7a5c8b91d
font_02_sfnt_off000137a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1