Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e142fff2d32819…

MALICIOUS

PDF

78.6 KB Created: 2021-09-22 23:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dcf02c0bea2d8480276cbe3ecc89bb41 SHA-1: e67ea54ffee4710601c144c927b9be0478710bfe SHA-256: c8e142fff2d328198cd5d605fb00129dce5d8e1fa03bed6121be9ff52be13bbb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=game+naruto+senki+3 PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16146a4aa7f7e8---64589620344.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/7cb5781d4574c498e1024662cc93e411/popodapepar.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/15205938256.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109072109405359.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/aa49185082b9697b350287b1ab405b36/wovudunizikotexaxenekata.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109151604049794.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/64911862167.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/66742998755.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/veridepeviv.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/wajuz.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/weviratoj.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/kewaz.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/98123243950.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7f041a00---bilorabizo.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/fiperodesemugajazef.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/90039484201.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/pazoberije.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/17368691202.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/tomusarurajuginexebijan.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/86311268564.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613e3f0f80ca2.pdfIn PDF document text
    • http://halanmilk.com/upload/files/15976287018.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0od0s7plho6u9km5ub3skvigvd/7859401432.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/sodalemovufepefagen.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_off0000cde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE6 18300 bytes
SHA-256: 52a89cdcd4de4e724f6eb6f11561b2fecde2552d40eee6174b09225521220a89
font_01_sfnt_off0000fd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD00 10624 bytes
SHA-256: dce108557e0cd52ff499d29ef09301fd5fe72a1bd0b99f332b9dae34798ccddf
font_02_sfnt_off00011563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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