Malicious PDF — malware analysis report

Static analysis result for SHA-256 368392d9f4273d7b…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 17:57:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14986b60063bf51bae9deac5314cfb4b SHA-1: e0b3419c0c299b9b327cf12563d13f22b44f05ed SHA-256: 368392d9f4273d7b64580c74d0e3634e38313ec8b67b46b7c2dac0db2b93469e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate that the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the numerous suspicious URLs strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://triptoboloyfoundation.org/editorsfiles/files/34915246114.pdf In PDF document text
    • http://altus.pl/userfiles/file/mufoba.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16114c6fdaaaf5---69794966801.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32803211150.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/84889073737.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/sakebotaludabow.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e5682df7f445aeb938510367fa682587/gigusifavugore.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210803_DF30C910BA467D33.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d81b71bde2---fowusesilamavo.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/70142772340.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf928e59c61---munimukorotor.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7a9cf52c2c5fd527435026f24efbaed/14890433804.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/movojax.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/pafidakigidasur.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8322247156f2977cc138217f3d0f9de7/80520282417.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/lorudagabuditevobabog.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/63294927000.pdfIn PDF document text
    • http://bananamusic.tw/uploads//files/202108101841406092.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcefad36ab---mulepifetakematakumijofiz.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5e5b9b76c---melonununujali.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/875741363.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/75950975337.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a2338643---17982950186.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/38635836002.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fb28de095ae---bopojilixexo.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/fipipixikejuwiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=life+magazine+pdfsPDF 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_off0000c8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE111 10496 bytes
SHA-256: 05891467db7246b3500512dc0c2d0892fc6fcc009ada6b1db34aa86f320dc2e3
font_02_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 17432 bytes
SHA-256: 0fb5225f537c8368ddd6981f44a035c24b5cd689e092b49e25e0c6e81f7be69f

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