Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b5404221b619d1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 03:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be88434b12defde5d5ce4a2b8641199a SHA-1: 57d266085427f875d5f21b749294d35840989aa1 SHA-256: d9b5404221b619d1992ae01909b2d78d0ebc42c70e025e5d24198a69fab5a493
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating an attempt to direct users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=elapsed+time+worksheets+3rd+grade+free PDF link annotation
    • http://silverspringabw.com/uploads/files/43432338649.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/80437754552.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/zexazu.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mubojazupaledanopale.pdfIn PDF document text
    • http://banquat.com/userfiles/files/jeforinokerikojisuropal.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210804060633.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/25556619816.pdfIn PDF document text
    • http://cold.lt/userfiles/file/65790925677.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/buledujivunubizogev.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/98837649115.pdfIn PDF document text
    • https://keluargamimpi.com/contents//files/lilokasekigujigikojo.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/folomol.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cfc101fb780f7615f810687a9aad6264/sexodotisonomiko.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47dcbc83f---27904947016.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/cv692fgqttu2rdfl4bqbf083ol/labomedesiba.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/desapenurugowavoja.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/31966017289.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/73142508993.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/44078540186.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9780d5a99---97274987221.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/wafevafil.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/35032489543.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xesojutimu.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/laxejed.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ffc8b7877ec---25961042928.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_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 17076 bytes
SHA-256: 96d67fa8e5ac32a9642e4cbf0f33d82c0260db27ec1228837583d3b3b9843eae
font_01_sfnt_off00010012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 11176 bytes
SHA-256: e679ea2ad3b98d539e59e59929bcc5175cccc0ed9ceb11d7d9b97312a3a99110
font_02_sfnt_off00011a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1