Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27fcfbfdf39f011…

MALICIOUS

PDF

92.4 KB Created: 2021-07-14 06:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f786f0776e219a647b3dbc3cd73a435 SHA-1: 0858beea63043dfe698fa2820f5f8617da6f6819 SHA-256: d27fcfbfdf39f011aa091fdc80020cc4835b6905199722f2644b39ffc9040168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://coretry.ru/uplcv?utm_term=i+have+to+keep+clearing+my+throat PDF link annotation
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608dccf395e71---9893446584.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a8749ba4a---benonesexaripadimes.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/fawigemopiwugepafutajitaf.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1b3e1a9---beziwasazimoronigodedibiw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d9a558ce2---dozezitegixabobulixipip.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/95141134981.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/jesavadokilati.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b001e9bba69---61813461888.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075681ac2564---vodadomapa.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3f8741ad376abcec25d048823faac07/91110094165.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ec25c9cd---62213447662.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/29f5d3bbdc92926c4bae7931100dafd7/sugakurubadopaze.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54620e59c8---vawesepunojijatewolebus.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/40328413414.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jenovak.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4ad521d36---zosifezisatokinubomo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/kvjikmpouj3sto1qt1u707mp11/55349588341.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/35449603538.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/10d87c6a14d63c0ffa04eb8876cbcd67/nifimumo.pdfIn PDF document text
    • http://greenreunion.org/clients/f/fd/fd69eab1634eeea6368acebbe5d5cb0d/File/kipatuvakug.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wigowogazilomiwipo.pdfIn PDF document text
    • http://hyderabadibiryanicorner.com/admin/images/file/87939333869.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/82364733878.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/ba0a1cac1f52494c0ae92874cd863fb4/89153168376.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/buwenidonudo.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_off00010780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F97 10876 bytes
SHA-256: 0d3efbcb4ac62ddd9d8be38a92ad0ee2bdd2ead93ebca9401a8fd3d7cc169166
font_02_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 16772 bytes
SHA-256: 4b3dd35544251bcc4e2e4ef3c1b7c28bfe7b9969b12942fb5e77d64e5afb4bf9