Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f96795ffb19d7f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 17:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3668e1745b78878062412a256b861746 SHA-1: 6b932c55cb6a2d413471c0cb4e1319423336fb94 SHA-256: d8f96795ffb19d7f5a371061faf95a441de5140dc0b5baba11ed584638234917
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://simsvizag.com/admin/uploadedfiles/file///jiminasada.pdf In PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f6ba0bca---79039380113.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/judalumukijurolok.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/dakifu.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/siwigumagojuk.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/vuzagijorawetipije.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/zepuxumafegezeruf.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/lisakosabe.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/82564803650.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/digovot.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613de80b9d481---81786205371.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/29341950193.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/wotowu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/wugeresaluzedewap.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613a773b184be---17634293507.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/92696902698.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jjmbhcdf0pdbs3rhtk359ik3sl/saxokeragil.pdfIn PDF document text
    • https://12shio3.com/contents/files/lomujitoxelal.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tudaferolakojabowuzesu.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210919_150533.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/savowaxefetigusalorijizit.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/36959373976.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/zadoga.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/27095167488.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/76446088485.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/fupuxafitonataz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+hide+text+messages+on+android+from+girlfriendPDF 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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 10980 bytes
SHA-256: 4d46f9a3630c430308fcd12340cdca5947a45d02da87ec49eed9e58608ee52ca
font_01_sfnt_off0000e2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 17956 bytes
SHA-256: 495e75531c40214d9b8435aac7430dd448393af796f8be8b743b88c9ee817605

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