Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5629625e6f589b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 07:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7f80e370041136fc965c2f779d8eb81 SHA-1: 1e5c27e77eb9663552abb869649b7cd7e9089650 SHA-256: 9e5629625e6f589b4c3815f33ca35c192f3f3efb8d7c0b8f665b5f954c60a4ce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple external URLs, several of which are hosted on compromised or disposable domains. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://pampa.be/uploads/userfiles/files/nojanajorivapepatagokimo.pdf In PDF document text
    • http://agendatourvietnam.com/hinhanh/file/ziduwebupojom.pdfIn PDF document text
    • http://mylodge-naoshima.com/93796144577.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/82558012621.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f079c0d3---87464116462.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/7791nhajhvonaq9vac6ifrcru0/mumopobikusinufinizeji.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/mukuzidegore.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/11555606092.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/pitokupovusapupoxim.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/vitikepiketurixo.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/71006640307.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/lekadanotigukom.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/riliximaburisukalefere.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/20688639077.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/63351611097.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/lutenimumisagad.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/35292347323.pdfIn PDF document text
    • http://lagrupacio.cat/file/somivaduwupivamokodumetup.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/77710079095.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/gikigagesajotopa.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b93b3696---75731615262.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/72501188691.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/sefixonodozutofozorol.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/gubisisopizexaroket.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/76971959519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tom+beauchamp+and+james+childress+principles+of+biomedical+ethicsPDF 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_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 11216 bytes
SHA-256: 426d49d4196a3c056d0de0b65da83bdc9402dd24cc65c1e914bf6aad3803172c
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 19156 bytes
SHA-256: 00a4da3ce15fb98d5b6a003b4666ac3dd7794107bc6cf06462e49d748bb5bff8
font_02_sfnt_off00011bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1