Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8add57e925fecf…

MALICIOUS

PDF

84.7 KB Created: 2021-09-05 01:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d0233c8cdc4e8d7a9ecef2d9de2306f SHA-1: 89a89d9e3fa6939ac88435abb50aed573176459c SHA-256: dd8add57e925fecff7fe66c584d461de73d13dd91dbfc77ba6ad93527dd70240
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using compromised or disposable infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=top+notch+2+third+edition+workbook+pdf PDF link annotation
    • http://alfavs.eu/userfiles/file/89491468466.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/51558627519.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160721f85aa9df---16350264691.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/vemipugegab.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/jonuredimewa.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/xuxujabojiguzatejifelukan.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/mopija.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/xetoxadezewegup.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/xabuwa.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/65735922085.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e6rftr44rnt6cesmqim4vp8ard/89086799072.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/42847247790.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/nadikanosasedibin.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a84ad2b895---4543151323.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/kigevibukimakewovebeb.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609c142c22b62---87783310515.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/79633433600.pdfIn PDF document text
    • http://timebymtm.com/upload/files/kisotejuloli.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/j53euak849u1qrbv52sdaa4l1m/36712821364.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/duduzoruvido.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161135c39464af---27401473944.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c583507c346---62075339950.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/bivadote.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e77c5c3a5---vivubefebexin.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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 21044 bytes
SHA-256: a8b58b7578471e041eb312d1bbc9c9ac6cc36d5a17de3d0dff86612e55d2c013
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 10744 bytes
SHA-256: 4ba257a1b04f5db76d608018aca3f41bf7506da85995b591edfc950a71a4140f

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