Malicious PDF — malware analysis report

Static analysis result for SHA-256 605717ccd26634d8…

MALICIOUS

PDF

82.2 KB Created: 2021-08-18 08:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd534070c883c3200879ca5cb3fb448b SHA-1: d2226b787853dcf18c69606c70b09e7d4cffeeaf SHA-256: 605717ccd26634d88ddae8a8fd7b8c6f9e7279a46ce2e87f903b413db4a27255
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URI heuristics further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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 https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e17b2c209---zogof.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160da804ceddec---napotidisofoxusuwut.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/32791933803.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a549efce136---difavape.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161110759d9ea5---66424090186.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xivedabekolabuwe.pdfIn PDF document text
    • http://hkalc.com/userfiles/manexal.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fdb2d6c53---zafofomupavobufigekome.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c05a10bf4d---buzamezadusorivigelu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/fesojinararikoguvopolij.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160807912c2df6---jivuvavoj.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/gavawizaxejejorabuj.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/47429617790.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/kojatabamuzujijapajobu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bjqojl2pmrgkr4p80nfqg129em/36198549058.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5vk8klu6vm9jft5l07ri7k1l51/60979262431.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/togexezufab.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd5b66edd---vebamikokazanakenenar.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/valafetelewemoju.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb26facc33---novixa.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/55280811230.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zovatadabaxozimew.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/87844009861.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/32159543250.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/buvuxezeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+adjust+water+temperature+on+faucetPDF 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_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10952 bytes
SHA-256: d8ff0e5ea628d773357f31e69f4b7455728a2fe6762959af8b188cd3d013d089
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 16384 bytes
SHA-256: 8fcbf0c92b859c2366e4e2d66f1fc000eb530255d322774f5c9a3a7d94820a44