Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd46db8011e966d…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 00:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 617a558ac975bfd2f61d37425e5d6c5a SHA-1: da334b7d81eb3f233aee0ae8d7f1b387be17d8b5 SHA-256: 5dd46db8011e966d3489f47f6722d49fa333216382f8753df5e07c938e11fb4b
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613879ce30a3a---59440657138.pdf In PDF document text
    • http://pol2-simf.ru/userfiles/file/lipijefonofole.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51017858682.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/364512617.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/bidebapilomomifujo.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/dulepetolipaveve.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/sibasosogewavugule.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021090402073973970.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/18269922496.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135659bc946c---6304244023.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/34018133939.pdfIn PDF document text
    • http://ledins.lv/cms/file/4461255586.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/zuvazokenasirogutexobev.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/37413363112.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/45383375844.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613914c5c0313---67913215373.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/pevubeg.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/80443319726.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614654c7494d8---tomelujufabixu.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/14998532479.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/45541547715.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/bibupiraruwazefawu.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/88573503778.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/rubomaxaxinativefufudusaz.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/66336965890.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=trasferire+file+su+scheda+sd+androidPDF 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_off0000d1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 16600 bytes
SHA-256: 38a88d40e9f9d3b4fc48c5003e09d163dd8e69d2fcd672ba187b7f9f8fa5280c
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 10540 bytes
SHA-256: bbdbabeca3588a42bd1a19ffbdb6338e4fb43ad6031e82e62950121f93aae267