Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d49bc6585615719…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 11:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8167a7f2976dab88ed6b299ee79f70c SHA-1: de4d4fe646d40bb5b6ba3d0e90dac662ea0a1edb SHA-256: 4d49bc6585615719009a08c546e9ba4f49c660c4cf5e8a458c8f5d9b4e68e28a
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to domains that appear to be compromised or disposable. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unewstoday.com/task/userimages/file/73758392336.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/78328685699.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/50530902171.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021913148375813.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/7908632398.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613169a2a1293---kedeti.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/184465d4e8a69a3f599824cbc56e50ff/bipoxasaroxedemotep.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/83b16e8414441d55b2d2c5dc8b90aec3/88768428719.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161392b1f062f5---40073983510.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/66670082425.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cfd06797b---tamavejuzezukusoluwuzo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/wufiviji.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/43344693196.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/15dcbd88b36c4c390cebed626ebd33e4/noxonarub.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/39979653337.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/46235684355.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/26520369439.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/ropete.pdfIn PDF document text
    • http://travellerisland.com/files/82741128929.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_6E831640700A8429.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/72268374661.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1b8a585f---61651491828.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/farujibavuvenezawaninewux.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/31796562762.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/64282885599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=life+as+we+know+it+tv+show+streamingPDF 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_off0000c1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1EB 17028 bytes
SHA-256: dc10eea785c379649073b6cc956de50d344c19e15ea4cd8be8c04143de3258b0
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10816 bytes
SHA-256: 33507b83e927375ecc2e6ef563b722b7eba542cfb26f67ab98cebdb8133f1557