Malicious PDF — malware analysis report

Static analysis result for SHA-256 58768a3594e9ec6b…

MALICIOUS

PDF

87.4 KB Created: 2021-06-28 00:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c3bf19c9e033de8496310e930db293fa SHA-1: 0c49aa5d21da2250dd918432257f9337ca3f5e35 SHA-256: 58768a3594e9ec6b557d129ed1b89c8c04ae1ae0640fb031b92eaeff94097f70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=day+tour+in+subic PDF link annotation
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b8f08360---kudilixebipumajut.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/rotunimawarezom.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a9dcc089cfbcdf61da06d07826bbaf36/84578240462.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_091157_130.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7e7125bb02efbd1a5fe69c4236e72db7/tipumerevelunemek.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/95175449635.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/89231362842.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9dc669653---8405503818.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/14228235653.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/zoviw.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/98227471271.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///zurijomujarax.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec66a885f---rarupaw.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4cf3246b7---lufubap.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4uc17d9nqrpksmumvs934qbka2/9100634964.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/damurukubodikanuzegarar.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/fezalovasodigutozu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/99480064014.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/948add607f2c04c241791542523a2ffe/pedukedeked.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/68609367525.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb52573ced---sudesito.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160726812213fc---lukedaxijozipogibolan.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/jakakidofup.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3d5b87a0---8925449415.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813daa87918---miroginurefakipamix.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72003c31fc---kadofamazanodibiwevas.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_off0000f46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46F 16860 bytes
SHA-256: c0ece8521d7be4dc34b0683812577864ad31f633306f8fa751e027170554dba5
font_01_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 10400 bytes
SHA-256: 8090bab6de5ad25db4d60ab8ec2f2970a3837ffe413f01b61aed26107d168066
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1