Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82a2559d7ce6580…

MALICIOUS

PDF

70.5 KB Created: 2021-06-23 12:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cfcabdf2dd4177268b0a63a472d57e78 SHA-1: 50cc9c0b6ac81b471853a26ca43a2df565945e49 SHA-256: f82a2559d7ce6580949482b7859333de9ddd1512874923bb6517ff0b24498831
156 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely leveraging T1059.007 (JavaScript) for exploitation or redirection, and T1566.001 (Spearphishing Attachment) as the initial access vector.

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 http://worthingtonpark101.com/userimages/37825419572.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609939a715245---50588357228.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/rovebafumowagebelesevib.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/31434377896.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ij6kvi0u5kvp2s4gf22a4cc896/67533776122.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070572ebcd0d---15299927897.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/141650438646.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a11ac48983bb7d1c85010444005f93ec/sozejabajapavifu.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/ripudi.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/490542640.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079139d6f544---34193402635.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57ef6b2bc2---lunosivemesuda.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea4d3896a---20336211718.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/noruvijobe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=worksheet+3+parallel+lines+cut+by+a+transversalPDF 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://scripts.sil.org/OFLIn 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_off0000bfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 5564 bytes
SHA-256: f1b184156d035012520745de4752ce4194761f8dc62666fc148f0f635ca2b92a
font_01_sfnt_off0000d2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D0 10412 bytes
SHA-256: 0d4d78dc2afcb36626be07ff951c3f7f992601db19e1afd336d86f788c014bbc
font_02_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 17460 bytes
SHA-256: b07aa600fa675ad37a1c4ceed325374d7813345f147006a391e86e3cbad6d498