Malicious PDF — malware analysis report

Static analysis result for SHA-256 2786c1df51801e8b…

MALICIOUS

PDF

73.5 KB Created: 2021-09-08 23:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26984a4ad3afd47da6937f26981728f7 SHA-1: 1a99cc32588291812f0e4ee01542784bc105f554 SHA-256: 2786c1df51801e8ba1b9ee30588913540a53c04fa26e2bccee97cf6f8f15ae9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of a URL with a 'utm_term' parameter further supports the idea of a campaign directing users to specific content, likely malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=how+to+install+stock+android+on+samsung PDF link annotation
    • http://kozelsk-adm.ru/files/uploads/files/wemolapukedaposotiwok.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109031610187310.pdfIn PDF document text
    • https://thehouseproduction.net/file/65710743362.pdfIn PDF document text
    • http://oilspecchem.com/files/63606886708.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/tinedo.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/kojum.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/87585371224.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/pewudosorolobowezegidopon.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/tikuzatelomuta.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613439a91bdbd---55838880353.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc4257125---jasalikozijuwizimadelazuv.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/murevuvewepa.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2124c8ba---88164678850.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133978b6aab4---85217085931.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/waxenisunekax.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/sesinunulemawawo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131e25020beb---kidonarewonorutotiwaw.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/vepunuzamatapasazaxer.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/tejawizivetirerefeb.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/zawitatajexose.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/karijuxexiburiwe.pdfIn PDF document text
    • http://totoumi.jp/upload/file/45248100066.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/89058558638.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/55805019131.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_off0000bc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16900 bytes
SHA-256: 334855c699c02aa5224e24798c74534a7b0b3e52b24d5d6c3c8b2e53fa5ecaba
font_02_sfnt_off0000ffa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA1 10852 bytes
SHA-256: 40164b57b1d94a0b69f83cbc3ba213b2ef0442c8daa74ca97b833f5eab78b103

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