Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a92a087c41d03b…

MALICIOUS

PDF

70.0 KB Created: 2021-06-25 01:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4547ad0d751309f3d563550ed683f6a SHA-1: eaa91825f1f805b6c949bc6bc96654e4eae0b104 SHA-256: 23a92a087c41d03b69faf39e441925ca9af314bdd45b632c9601bd17ebc7967c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, many of which appear to be compromised WordPress uploads, suggesting a link farm designed to distribute malware. The document body, though heavily obfuscated, contains references to 'Minecraft free pocket edition online', indicating a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=minecraft+free+pocket+edition+online
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3eabb2c49---kisalotujutesejis.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b19d6a916---89974411187.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad1030f0b9---kexapeno.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8701881782df8d9db89077120b834c98/vomuvanolomovetox.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1175172c39971158f2accd1e6c73a76d/23627605120.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/532ad93e22076d3160da2540cb378691/29317590854.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28cd17dcb911c029f307cb89d937881d/keduseneverew.pdf
    • http://naturallabs.de/userfiles/file/dijukaweka.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/51431188357.pdf
    • http://kadh.kr/bobod/upload/file/50407515212.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/m0ue9skp10t3b2l5ot5eojuag4/69265360290.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ee0427f85fc656faa9e9ab09455c3a76/40570535628.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd590628b---degoxoduviwiwena.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/do1eqpcece4uhh6v3f3pf0ud9i/tanitawuvubugewexopo.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e588963fd8---93901957815.pdf
    • http://dolphinegypt.net/userfiles/file/40715199118.pdf
    • https://o-dance.com/upload/files/wonewiluzelutekidamilir.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d407.bin
65678e2e00f8f337fae01e06585b10ef6a22833a448fc2cfd1364d00455a323c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 5040 bytes
font_01_sfnt_off0000e550.bin
240b6b90ade21fbf47e19a0e78d427fa0662ee60c15cd4e8219526134419627d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 11132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.