Malicious PDF — malware analysis report

Static analysis result for SHA-256 832b1e59e5859edf…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 12:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bfea6e954a2fbbf2bd91523a2e1359df SHA-1: 5a0a56f1060fe733a61da90d9a536da589a17af5 SHA-256: 832b1e59e5859edf840ae260c3ff2e95394728328255ca8bc122d64b64054274
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 http://hzkontejnery.cz/ckfinder/userfiles/files/bomevuw.pdf In PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/tisexav.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e822228fa---14269208308.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/54733334221.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/mezusulikekisumo.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/2487939115.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/gopelapex.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace49d09e90---23977993902.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095b309347fe---wutakemelaliz.pdfIn PDF document text
    • http://kasargod.net/uploads/file/57099562254.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/nvkm4poea3e8fcgje0oqn89cm1/tokowebozonezoweginuvulob.pdfIn PDF document text
    • http://smartcirclegroup.com/userfiles/file/nuwuwabexumafa.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2d790ca19868cb1b02698c977a83d73c/zevetexosipezujulasodi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/49656701344.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/63142295836.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aaff2818c95e2c1ee039467cf600313/dovimo.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/febunudigemevanetatobol.pdfIn PDF document text
    • http://mousike.it/img_ins/files/29490100091.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2c422d7e---727131369.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add3c927273---19083578506.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/xisodejeradeg.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/gevosilabowolon.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/lumimiduzepikimederoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=swamy+handbook+2020+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_off0000c26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26A 10876 bytes
SHA-256: b5c6594ca0bca3ad9567097c013275d3465f94f97c86953a4d59076fd9e0370a
font_01_sfnt_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 17484 bytes
SHA-256: 570f8b497c43cff5da1e125828abe277c0ef175b91bfa25df10b94b29d0f8d77
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1