Malicious PDF — malware analysis report

Static analysis result for SHA-256 46ccfb97405de0b6…

MALICIOUS

PDF

98.1 KB Created: 2021-07-03 00:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e82f5b148e064283d2ff638bc179c756 SHA-1: 9622f40670398189382fac7c180296abc5e07fef SHA-256: 46ccfb97405de0b66c177962a4da1d93868e041fc63feafbe99bd70defe162cc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically related to phishing. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e77b5c45f---37899071573.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae678a0480a---mesibi.pdfIn PDF document text
    • http://runo34.ru/attachments/file/91356105585.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/viziwifusasuwuranepokevop.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/kimazirodolafuviketeb.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/sesoworav.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/0be6e822109c828450753e2a81334edc/83886081219.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/26313488d31c8513693bc10b2813a7f1/99851164760.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/18435104173.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9688d1a3---90791460298.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/30924747957.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/afed44cc89adb83a6ff8f164eb64f025/6426120626.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/90f7c40c3ca9bbcf0cb2b9e545d0b2c1/masojizolezuduse.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160c75297a878c---87178698148.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/14c5164547d89aef0ece845844e29937/zogaxupar.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pt2uu577u1vsohch2mvfd3ms97/ninoduwegaxijufipi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160768671c8be0---59985036273.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/xiwafega.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/10944593168.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621228052.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/14620638391.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/86669039189.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/dugiwujone.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b56c434b---8269292925.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1908d357ee44de962aeed47c138e08b4/netutovovijelobupiwu.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/89909768713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=seafood+stores+near+mePDF 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_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000133c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C8 18652 bytes
SHA-256: c3932a14c69a8dff830ecdf8d117fec5001e9ac90df544248d6da4b4ed481a3f
font_02_sfnt_off00016375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16375 10452 bytes
SHA-256: e66ae4a3677a2d11a6a58500f222219ec1226ca0e33fd98fd74bc0b3988e38a7