Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdcba7adfc8b6f6…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 10:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 79b3b20ff6ec439015cbd15c9ec62f0c SHA-1: 785c970858ae7ff64befef4bf08811228bbfd68e SHA-256: 6bdcba7adfc8b6f6519f1dbb4cb3edca297bc3b8d7467db05cb3e808f80883ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS upload storage or disposable hosting. The embedded JavaScript likely serves to redirect the user to malicious sites or download further payloads. The overall goal appears to be phishing or directing users to malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=vantage+point+full+movie+download PDF link annotation
    • http://stepasidemedical.ie/images/uploads/file/movujizafedat.pdfIn PDF document text
    • http://cci.dboem.com/js/upload/ckfinder/files/fakobukizupuj.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gusakibonizixitivijava.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/84865889103.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/78099310630.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3b4185fdc---74795971168.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/kmnbpqvrp3evnejofgr214165c/30654603919.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/78402937334.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16152a66483ae4---25123974031.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/wusojugizomowajiben.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb188137be---28693226017.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/83565947786.pdfIn PDF document text
    • http://alocainghien.com/uploads/userfiles/file/60441769931.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/10473437740.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/zepibetulemudokogevugit.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/99498827569.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/pivalefamisipu.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/67175593701.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/96973699775.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/fawopejo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/c2dfe0e4345d89683bc9020a43194168/81419233973.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109081534501554.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/3903334644.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/kubupowogesubovud.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_off0000b312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB29 10796 bytes
SHA-256: 72a3ecd5a12e3803775a2a516679791d598f4608fd0dc75e5a70fd4100d5eda2
font_02_sfnt_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 16984 bytes
SHA-256: 9913e593368fd240405a67add043c3d6ab070f2e54f2b85a2e36632b480c9275