Malicious PDF — malware analysis report

Static analysis result for SHA-256 7540ff4d8b99a295…

MALICIOUS

PDF

80.6 KB Created: 2021-06-29 12:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f25207110d28967df37db59c2dc66d88 SHA-1: 3fee4183dcbdda0c86576969303461279f9fd3f9 SHA-256: 7540ff4d8b99a2957bb148c56d4769e9904c95cda6939a50f37adeb8d11b0c51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/e7e93fc38c82ec009b559605c01fd61b/xopawanudawewij.pdf In PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160860f48ae85d---15263506040.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ba95d66a---tasovisowizapusomegob.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/8944287167.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2d0ba01e---pitilasunobuvijawomi.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/bf99cc5e7369c31de6f41a7304a75d42/279711789.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/67655067514.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609050f392be1---37243273209.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/mrqhr03nomc8380rbnl2tqnebs/17810182878.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/60553544711.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d42c1b45---sevoto.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/5b4554e66d608d7bf71201c338bcc1f5/zezolitudoxadotikit.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec61aa3c3a---buzat.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16080d87b30b24---18409026324.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5381a3cc0---3281090362.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/vasuselenezigosej.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5738aef2e7a30729767881e972bf5f82/8438735120.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/2vuerleijakakhu2hfkbkuv71h/83650222022.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/10087278153.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf58e788a74---zapiduvelopetimawapa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c703de73090---silivefafowojalizutor.pdfIn PDF document text
    • http://khochailo.com/upload/ck/files/89991866648.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/db946bc53489de3c0c1a48f530f98bfc/52297817035.pdfIn PDF document text
    • http://effektfilm.de/files/file/zivujebobilolegexifaj.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/nevatemika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=got+this+feeling+deep+in+my+soulPDF 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_off0000d46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46D 10936 bytes
SHA-256: dd8bfe21fcafc183ecfab42f859f7911783104c77113b700662d06a662f7dfa6
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 18908 bytes
SHA-256: 7a21e6509b86f9d734ed5733b0fb73a8d7d7df4d3eeeb99593fca12e56265332
font_02_sfnt_off00011cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1