Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c477cfa20c237a0…

MALICIOUS

PDF

80.4 KB Created: 2021-09-18 17:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e7cca6029386e53ec724e6e65f89653 SHA-1: 76c3a92b071eaea25fb967a4afbd0b667a95c901 SHA-256: 9c477cfa20c237a04c3db716c497841fdeed3fa23de1ec67d9765df6e2498bf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated maliciousness. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to distribute malware or lead to phishing sites. While no scripts were explicitly extracted, the PDF structure and URL analysis strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908145221439120.pdf In PDF document text
    • https://martas.vodrsport.cz/uploads/files/42523664484.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/38779336337.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/dasolinuwimugutijeguvus.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53e24f234---tesisefega.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/lefazo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/c89ml11f6ilql1gv7u8ugukml5/kufup.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/sefivebosum.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/ritavarofuxewosopizowogew.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b92f199824---36835325425.pdfIn PDF document text
    • http://drironcat.com/images/file/70193625828.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/8109042642.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614463cb40e4d---25682701025.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/zajidigobobepodada.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142afa43c064---guvazetarapogisinu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/49085940693.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614385e121798.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/9964293404.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/kijememugazupelikolawavut.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/risawozasoxafani.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/65622183160.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/73536819191.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/28103e36a17792f5695596c1ad4fa669/40854080069.pdfIn PDF document text
    • https://mlspoland.co/files/file/16055574707.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/35732246727.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/16878224122.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/jitulupoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+retrieve+a+draft+text+message+on+androidPDF link annotation
    • 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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 10896 bytes
SHA-256: 804a6366cb3872771d826045fd58786a4822848d76995d0c3fac33d5fa16406f
font_01_sfnt_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001060a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060A 17796 bytes
SHA-256: 14238216e469b0fb631eb1b22d0094a56062b27f7a3d65b4a8df7cf7656854b1