Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b9828fe82601350…

MALICIOUS

PDF

87.3 KB Created: 2021-09-21 13:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ccd7e26354e92f782a804afdecb0a97d SHA-1: 524d50bea0b981fb9bf90f150cc646e5cc362eb4 SHA-256: 0b9828fe82601350bfcde5cf9845515d0a8e7006afb0e5d13314b61ab26c0505
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, suggesting its purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=best+anime+games+phone PDF link annotation
    • http://braghieriarchitettura.com/userfiles/files/xejisafivufekak.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/36768076076.pdfIn PDF document text
    • https://ekransamara.ru/files/84939439073.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/74726182748.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/fabudopowevigiweteb.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/98090686360.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/10405599226.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/19438663368.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///50734424613.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/woxilixavelapitido.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130573d292d7---suxarevuwazubub.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/10527613984.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/tudoxewirisosenakipiti.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/duvozaxapanasuju.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/fesenivusi.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/lulajelojoxeji.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/jisamigurulox.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f44cc4393fd2b80d8c4e7992aaeff9db/nozavubasi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4fuh0h0emplur0nfks19lkqmoq/suduwoxoletasofamufi.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/13659152087.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/nedekenarumutareduzuxizu.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/kibavirusa.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/71921496495.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 10608 bytes
SHA-256: 1e96a6d1e9be30d7251afd1ebe57e71b60cd39692f488e1faf2352121ba232ef
font_01_sfnt_off000107a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A3 18652 bytes
SHA-256: 36004e3331001d6753757b52127b163b64cf45965872fe53a8701c2e5259204b
font_02_sfnt_off00013799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1