Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b46f977872a2d0…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 02:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68761bc3b3894df115b797dae4d832b1 SHA-1: 133d91cc1b3cf7b518668ac097286ec3d5cea162 SHA-256: e5b46f977872a2d0e38761413ff6a25125d4aa2c38f75a86e1797462507466a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that act as a link farm, directing users to various external websites. Several of these URLs point to compromised WordPress installations, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://wastran.ru/uplcv?utm_term=how+to+connect+wifi+password+show+in+mobile PDF link annotation
    • https://shriramsteels.in/public/ckfinder/userfiles/files/mefetobosapokifotawok.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/98482735751.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133ddb60b1bc---zukadiwonufejevimug.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a94568c72---vumado.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/60093348696.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fulix.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3d36d317294407377a956c4258ce5024/24540448122.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/36393140270.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb7fc4f61---tifevovuxarutizipipe.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/79538684467.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/81396336432.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/a618f28c58912f8b9c7a9ee0d69ca6c0/niloviro.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/60709733033.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/vijivewuk.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/30571973133.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/nedisinegusiga.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210910_0B182CA566A1F212.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/bofomiguwizaxof.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/govezelutalozupunenisik.pdfIn PDF document text
    • http://d-innovation.com/upload/files/xufumub.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161437e7e975e7---sunabe.pdfIn PDF document text
    • http://emannsltd.com/userfiles/satezumawixuzaxukav.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///52865498579.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/tokawenazotazag.pdfIn PDF document text
    • https://hotelcorona.ro/files/1684795248.pdfIn PDF document text
    • http://julianina.de/upload/file/xenulibugelazuw.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_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 11104 bytes
SHA-256: 92e5c538a772625a7803d975a7ea94a7ca04b2543b0a1b4a256de853859f2989
font_01_sfnt_off000107a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A5 18060 bytes
SHA-256: 986b8a077207332bfb84a7f7944face341e1032075a314041d02d29301342878
font_02_sfnt_off00013601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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