Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6e778686ffbb57…

MALICIOUS

PDF

86.5 KB Created: 2021-06-27 11:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2674258efb3258ad5a9fe91ff4301a5e SHA-1: 4548eb8a6b8d6db1dd25b84c5ef999791196b966 SHA-256: df6e778686ffbb5766449d81f347108962fa2921af066b1c2de02985441b4c42
96 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to host a collection of links, likely for redirection to malicious or phishing content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/40dad75c7e4ec126b66f8cb759aeca4b/petunutuluxifosi.pdf In PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210624_DFC1B583FDCBC2DC.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/nutobodis.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/tetus.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/24779523227.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a008c66a7---fovugol.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/tugqk91qnteson0gdm5av81t86/mefekojug.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/74717385361.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/85541715669.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9614d4c9a8---21975727477.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/sezaxa.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6d8a1f13650b04b8b835fc7d792028d3/jatovamuxamavuf.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/42c934699c03e478bdcae320be33bda8/47533523524.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/24164202875.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a272db6b8b2---getunokubanojetibavo.pdfIn PDF document text
    • https://proxus.nl/file/rufeluzovexuw.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608da91a1cf1d---90641125083.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/wirazixetipon.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/23052199991.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/37940988016.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6242934bcb---komewubej.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/57430517520.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f8cdf3c08911f6b41aad9afffb4b3fd7/53076076292.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16096462f8bece---butusozibeviviram.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+fifth+witnessPDF 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_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 17340 bytes
SHA-256: 3caaa2a4c9b1f4a3f74543a16dd542c5d28331c8beaa4d4c280c8bc8cbcd74e5
font_01_sfnt_off00011f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 9932 bytes
SHA-256: be9f45e47ba2c1bd7b0135fe8839566ee5fa0d7673435dda0915183b2bac93c9
font_02_sfnt_off00013552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1