Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d2ba76bf1e10d7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-18 18:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a7c73bfe18728f92972deaa09ded600 SHA-1: 217b6c781aed060991d5a8b58c2d87d31d6d1de8 SHA-256: 18d2ba76bf1e10d7dc3df247c34f132fe80e96cda8af6991aa3e84e446fd9315
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://faktxeber.com/resimler/files/lujijexusugiraledosebo.pdf In PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16142c5827408b---jaranokosibusoluxasolij.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109020125401160.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/38236855060.pdfIn PDF document text
    • http://headrepublic.pl/images/files/8886343092.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/12125895325.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/38002543793.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/95960786862.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/71524204057.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/80288516101.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf23c5a600---47890464301.pdfIn PDF document text
    • https://autoskola-scp.com/files/97855424373.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/toxatezoxidoxofonaxusari.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/60981434857.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ku1j3h2nrosl9htld6rg0r3jqv/65491996088.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/kujebavidevax.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/56129092912.pdfIn PDF document text
    • http://carbonelite.ru/file/44178831407.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161412ba6ac920---zogebawilurezudani.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/31969540056.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/20617416178.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/xigabepikatemiko.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161457367e98ac---97719096763.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/46061050367.pdfIn PDF document text
    • https://gameclub.by/uploads/files/48463701765.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/37739756946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=drastic+ds+emulator+fullPDF link annotation
    • http://irodori.kir.jp/files/file/lisepotajatitesodatilo.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_off0000c659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC659 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE70 10636 bytes
SHA-256: 331cb0953ce62c0124a5f6021f98ba966d08dbc2be295eed980c321780e258b4
font_02_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 17988 bytes
SHA-256: 9bf3318102a20cdf99fef5e60f016322c2fa2701af5b8c39ec0b2a1d8523076f

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