Malicious PDF — malware analysis report

Static analysis result for SHA-256 610aa00eb5b7d375…

MALICIOUS

PDF

76.0 KB Created: 2021-09-10 20:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6ff84ae5e71b34fb4057468e568c4a58 SHA-1: e5ad59569bf94f08a3ffbc87268fce3598e901c4 SHA-256: 610aa00eb5b7d3751e84d2ce1ca1a462a87f74e44a1e135f018262863fed8f3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting suggests a phishing or malware distribution campaign, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613433b35dcd8---rodiwaxebazegide.pdf In PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/73776010317.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/dogaxel.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/41416986707.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613721c3f06ca---guberegipisinutu.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/6033185269.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c349aef9c0e20277523e88d9dcde8208/12419258904.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ae022870---wixafewovidarulevebot.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tezixaxosisokomit.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b470ea837a---nazego.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1e685fef---balawibijabizopobute.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/66529074642.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/puxugaxonisugixunazuxam.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/45429468454.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/68206415805.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/34641471760.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/timexu.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/lubokosema.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/19465368824.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/gipibulakedifij.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/fuponixukigopura.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7hke47h2mknj6fhqla56ulnis7/dasibumelibofubuxufos.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zigewozinokakum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2021+driving+gamesPDF 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_off0000c617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC617 10588 bytes
SHA-256: 76a664e60676b2b41ff0ee8a1232e3f4953ac245a19e08fde0641f8c0a9b6a01
font_01_sfnt_off0000de21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 17116 bytes
SHA-256: 758f130d4e2127815b2c45ad7694eb06a194b58a9e9190e3107b574030abf83b
font_02_sfnt_off00010aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1