Malicious PDF — malware analysis report

Static analysis result for SHA-256 db18758fc24029eb…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 18:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f674502d8280b57f6bfbb0e51b346f7 SHA-1: d4acd7285933da4b8c115d61ff153f2f80fd1537 SHA-256: db18758fc24029eb593cb00e063fe8430e71e6095e6b5c9aad0d4db83243c57d
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and multiple external URLs, many of which point to compromised WordPress sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a browser extension or update. The embedded JavaScript and link farm structure suggest the document is designed to redirect users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=chrome+browsers+for+android PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/156e2fa0db301860426b3995b061fab2/bilekemoredife.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1853fb3935f673381e7b96625a40b445/93556540653.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/serekaw.pdfIn PDF document text
    • https://oferta.lt/i/File/38345091792.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/fotujozasiniwudoki.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754ac1e288---74800976708.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/84025581455.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b01cf0ac5490694bb0f4f8470900f0df/43217738354.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/78384621294.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/maganigonamolinukodoxoruz.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/xetojuguji.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9d749329---25248927783.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/wojolarugabiwumimerodeweg.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/gotiwololamakosago.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/kimivuwozixuvurevarafatu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d6650e4eeb8a18787519c683691bf73f/69748319744.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97387418097.pdfIn PDF document text
    • http://beijingteye.com/upload/files/46758319665.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/rerugufuvezodofonuzofod.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/moram.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631103586/file/81952459509.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210901223433492.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/53352810123.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/notagesiluruxagi.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 10732 bytes
SHA-256: 65e89239cd054f45918a3d7840cba3df376da17d674ec06883ee12d39918256a
font_01_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11228 18500 bytes
SHA-256: d92a651582c524decbacef2e7f7492b5268179de88d67723b7b3d81ff2566080

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