Malicious PDF — malware analysis report

Static analysis result for SHA-256 799c24c4bd1fadda…

MALICIOUS

PDF

80.1 KB Created: 2021-09-03 21:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 64faa547199debe91c869cba753e56fc SHA-1: c7c4c14c6c8a0e6ec1bbe7a424c26ac5ca38ace4 SHA-256: 799c24c4bd1fadda3636a158b1b0bc18923a051f1f59b3c5f29aba6ff98fe9ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to other PDF files hosted on compromised websites or disposable domains. This behavior is characteristic of a link farm used to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/66b02ae01f9b0ae4ee66bc1fde7915e9/jomibaporojasebaz.pdf In PDF document text
    • https://aldapa.eus/files/galeria/files/88412329647.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/49627299892.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/851a4b70857e5c009aa5099077b18ad8/10013508854.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/tevapo.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/79946767320.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/fimepadevabudoxufijol.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e37749a70---kojeparajibifu.pdfIn PDF document text
    • https://aordonez.com/images/contenidos/files/82698510785.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/tekutob.pdfIn PDF document text
    • https://cakkue.com/contents//files/dekijefumenivipuvedewe.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0695e8ed---41046270834.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9361e8840f---sijevuvu.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/xeloroxud.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a0049473---paweporokaxugebibilukapa.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/pasajerexizufexab.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/9037497177.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/rolufovelunoramivuj.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zokajimobeno.pdfIn PDF document text
    • http://ipceurope.com/assets/file/24442949739.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/68624543229.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/60394161914.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/12646103201.pdfIn PDF document text
    • http://beiks.info/public/file/60357060596.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e0c635b64---86447818846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=self+healing+concrete+project+pdfPDF 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_off0000d544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD544 10936 bytes
SHA-256: 769d7d31ef615c0932f54cd0fc07fcdd5f5ab6a4e24d3af2c6db5a782a6e2c0c
font_01_sfnt_off0000ee49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE49 17300 bytes
SHA-256: 9e751a5cb5eab601c04041701368e4409d98baa0444d53d2b07684861f73af16
font_02_sfnt_off00011b09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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