Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a0407438337360…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 12:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7bbb1dfe1d7eb19c65e5a85a3203573e SHA-1: 6f5f48ce19706d91bcc1e3ffe7ff8ca2bbf10f06 SHA-256: 56a04074383373608e358f4740a59beff5a2e61404a9cf46fe7b6e76744ae8d0
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm, indicating it's designed to redirect users to other sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://bisleri.genefied.co/ckfinder/userfiles/files/52310821287.pdf In PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/bovakobemotur.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/fijorowaridobetat.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/17399369362.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/2083351729.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogotonepasox.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/newupomovilulewasor.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0ff4bb6e---zunawosokerobepevilimine.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/mozajesivomiladexikorixo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448733d9ae9---82632889632.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/37097637373.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/98696279507.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/16289592357.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff22556865---61265883236.pdfIn PDF document text
    • https://avflash.nl/upload/files/1453528853.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/zifujixutabuxi.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/36c527e212b8fca2e6b4b6c38d5d0dfd.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/30301783351.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/joremalewidolusipital.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/jitinewisa.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/71284699888.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/52121479005.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/87a2c92d56e9b2433f77f7bbe93d1c5c/gosokagivowadamizupexiko.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/dipozoxotigokutaki.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/65899408843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=mathews+medicine+7th+edition+pdf+free+downloadPDF 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_off0000bcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 11016 bytes
SHA-256: d8185a207491ad04ba90e5ed3ed162514164ccc976e30bd53790457f21283248
font_02_sfnt_off0000ee5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5E 18388 bytes
SHA-256: 7a7b343e128be5a3bc53990901df2b86517008c4dc16d7dd366aff7849b824c9