Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b424b2ed45f1e3e…

MALICIOUS

PDF

72.8 KB Created: 2021-07-03 12:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a205a88a9f2d781bd87ad957a6002cb0 SHA-1: bcc85fcd07ba8af33d2eef2965598084425cd4ef SHA-256: 6b424b2ed45f1e3ec9f689bb32e818dc3cbc4ae4b819480daae2a642d19edbe1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the final malicious destination. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=st+anthony+claret+mass+times PDF link annotation
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/5t8nnb8674kvfjslm88fdvpihf/kabukosinojoxoz.pdfIn PDF document text
    • http://asfalon.com/__files/file/78584549201.pdfIn PDF document text
    • http://rapet.hu/files/takuzikitajivigipat.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/35644820400.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/63507653205.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/ragefip.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/16429465250.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/pafopujen.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824517da046---betexumokitivuka.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746e1b7c221---bararepegevexaniwitebod.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/62664949156.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa2a8822e---99175834149.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd242eaf63---piwujegeninekujedorufese.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075567a32dcf---24119796010.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/90369971128.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/palelidikowebo.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5fce8b6a9afb6b9772cb18bee84338d5/naburowapuroset.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/96019642242.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/53039592809.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/53758807821.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b3f7f214a807e8dfb469d2f1c477579b/88657457128.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/gopajugefolemusiv.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/derat.pdfIn PDF document text
    • 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_off0000bc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 10684 bytes
SHA-256: 39852313a4b24b2963058380e35f7594e3bbf0ce8915f3bd0e53f938d36bf993
font_01_sfnt_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 15968 bytes
SHA-256: fc68a966bd5c57599ee0771c1f2ff4cc3109d2b0ec63ff61bdeaa9c897bcfe28
font_02_sfnt_off0000fe22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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