Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a91833a25c347e…

MALICIOUS

PDF

73.6 KB Created: 2021-09-27 21:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 747392c874e20ee8167c277cd099cb6d SHA-1: 8757c20898e9e0f26057c13f7bcfd3b369be88ee SHA-256: c8a91833a25c347e05520433e147ee78e5e18df2af7abeccb9a19ed3c691242c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farm heuristics, indicating a strong intent to redirect users to potentially malicious websites. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the document's structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=neon+devil+crown+photo+editor PDF link annotation
    • http://sanchariglobal.com/userfiles/file/93970984136.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/vikisetefovowavufav.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/28047979301.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/76333563089.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f1496d65212bd3f8abd22001be1c6d5b/xujuxutix.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/finuvadasejologif.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210923140535.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/80ede388b55eabc2ff5df58589f80923/12144793664.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/93154886996.pdfIn PDF document text
    • https://tierlistei.ch/downloads/wotalogizuboxaweroz.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/12791490560.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wivonolajedux.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/2ec517e316f62dbc8519120f5c2c8939/liwidemubis.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/jorodevavegijebinajafamu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d5393eaa8---99829551818.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/wikavov.pdfIn PDF document text
    • http://3sdent.com/upload/files/judasotazabaxadefu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/03a29654b570bdaa4e3c320e7644d40c/zawoxugufegaro.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/12317022131.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/fediwuzegerib.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/nigujademubaxuv.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/fogevoler.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108311905372170.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/fojiwudujigumitamujituvip.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/27795831001.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_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 17756 bytes
SHA-256: eed6d643bdd53e7cfcc7950ed8d24cac8d4809c7af126a254a1fa8cfed84fb59
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10412 bytes
SHA-256: 77a6703c06dc185c1c828775a19c21b684ca228658f4a7f93939c7d8dcfa6358