Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d67eb50198a39a0…

MALICIOUS

PDF

72.2 KB Created: 2021-09-21 07:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b6a7e8559820c491afec8a744fc36d5f SHA-1: 51966dd56048b56010c5e070ed1677d4fc3c746d SHA-256: 3d67eb50198a39a093a02733c0e2697cc69e0743f3aae9e59afc74f2a61c5469
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farms pointing to various domains, suggesting an attempt to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, and the presence of 'utm_term' parameters suggests tracking or campaign-related activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=satanic+bible+online+download PDF link annotation
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/45649639106.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/81848853821.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/65251400355.pdfIn PDF document text
    • https://airbays.com/userfiles/file/xafamirotatujikej.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66433161371.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/16692983865.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/59896842937.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/lurobukazupod.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/sinomezilanidisubokuk.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/67295605185.pdfIn PDF document text
    • https://ppntassone.it/dati/upload/file/72452382333.pdfIn PDF document text
    • https://invision.buzyhub.com/files/54060807813.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07ba5280a---28091500258.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/baketeseratuf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614031f3b70a1---3786055321.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914174315.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/24921400790.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210916121122.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613afa50d850d---96192822733.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/rufalejisidivudaretotus.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/025f57840a18c78f2459bd367005d598/dinusemodukatosetube.pdfIn PDF document text
    • 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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 16252 bytes
SHA-256: b86a3c613361b349c0acd0927aad601c684f3ea8d05bdf4cca3593b13abd7fb0
font_01_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 10396 bytes
SHA-256: 6e1f2b2e1bf9962ee5778c064c900fa862396a99703c12eacf8dacf119311a83
font_02_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1