Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19323c20e91bc58…

MALICIOUS

PDF

73.7 KB Created: 2021-06-06 08:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d35b6b97187da9bad4c7782af5565a9b SHA-1: 9514b6e7596fa748267c997b4ef0935a263ec0ef SHA-256: d19323c20e91bc58957a9039e6fa35ad12de1ddf2484f68665ed0318904c9a05
96 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external URIs and the high risk score suggest the document is designed to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=how+to+get+free+skips+on+roblox+mega+fun+obby
    • http://agcslohian.com/userfiles/file/bokozuzedobamusewibit.pdf
    • http://jpind.pl/userfiles/file/70041715601.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076619db7911---bejop.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/099c0e4e790ca22782dce7cca3a2147b/56494258136.pdf
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/85086790112.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/498cc721becaaf7d421064ee58a0f0f9/jozasujidakesejuzuwefe.pdf
    • http://hutergroup.de/userfiles/file/51956630779.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/3f4qkjc5bqr8rlk8u8vlamd8sp/movibabosibaxad.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098984eb0a9f---2219068272.pdf
    • http://maasmartcity.com/userfiles/file/59570409826.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a123c6005a---51056735223.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3be2aeab75c5fc9c67529d792327e642/xokazuxekadenib.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b93f909765b---96177463463.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/fba0gp6qphgpgmbbjvrk8fd843/3685126085.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/7cebdbe42a263f4a509ed1aa2a53297b/towetawurivunibiduzal.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807defb3670---xepuruledizogezaneb.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/psle9k8de2s4jc4gh3uvp6bfht/fizibumub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f6.bin
dfef32918c5368c62a2e1090171658d82f8a53560dbe3e650631c83dc16ddc55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F6 5648 bytes
font_01_sfnt_off0000e935.bin
ece32b26030aaa860506a55e1ecbbda0639ee9ef8c81ccbdebadcf1b7b205b37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 3352 bytes
font_02_sfnt_off0000f597.bin
cf37d251bc5ed2f759842f4bcc15bf5469b57499f16f38edd11ad80e820f657d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10444 bytes

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