Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e6200e44b00cbc…

MALICIOUS

PDF

88.7 KB Created: 2021-06-25 23:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3ff2b6a66a1a72c4f5abee9c66666168 SHA-1: d9017f36bd373c528e495a2e90d1c5a178f761da SHA-256: 31e6200e44b00cbc5ca09b63349499070d5a3d8ce60f4be2c2b73f932d687ff0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to manipulate search results or lead users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bilegt.mn/userfiles/files/guripefikowu.pdf In PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gipiwawobebuvubimakudajo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076298046477---davadevetu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609fb3734b668---92512333945.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/tojekudikexab.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/fukuboxewu.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748f91b7558---8605826511.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/98970693337.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/4518322e69979e59b87c8692465c1840/jonixofuvazibuvesot.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/99eb03a8336d8ee5d447501ae0222013/77792089399.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/87b785c6502c345526cdf331ebb17bd9/gazikodomepovejadulojulu.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/9p1i0cultmph93bhct2bl4ma2n/65024949180.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/64603903644.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/bulabem.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160ae51dbb22eb---46933785647.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0b38936a61cfb9807b196838829bd4e5/kesiligezazilej.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/55143263082.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2758aff73964d85628ac88ecbcb6bc90/nulisorerixevesalosa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/12226391526.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/wirujaxojovupig.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gowomemik.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/ce76194212aa7e4caeb04b259b525074/37863348383.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1feece989c---45366582207.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pdifnb1avd20p7pje07lg81t57/redale.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096efba8e374---nokabekesegapebes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ps4+the+forest+cheatsPDF 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_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10268 bytes
SHA-256: 327258d34ff29c1721fd86739daa2bbcd77c9cf57ce2b90bfbb62381fa03ec2f
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 17748 bytes
SHA-256: 48d0a7f1b876104ddb873de7b4db0f84a78e50d6f4796c23d2c1132874c90ae7
font_02_sfnt_off00013dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1