Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5c5eb444f06e62…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 12:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6c4c1abfe5d5cebc05321eebb655b42 SHA-1: 5226ea664207456b9b85aefa793dd127efb22fdf SHA-256: cd5c5eb444f06e621c257a0e476d413e3b88a411bfe907cd6dd435d656e9680f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://queure.ru/uplcv?utm_term=the+best+uzi+loadout PDF link annotation
    • https://planningpvedh.nl/ckfinder/userfiles/files/futaxelunilejuwexegeg.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/42606274904.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/85315529474.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614487cd09c8f---4061881012.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/94707641944.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/94979306836.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/nebexotagirasisekunevo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428c539c4f2---84568270847.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/14404657083.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/voxoxilimafafuzapirek.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/64256411407.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/70621060700.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/44635547871.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/57429794354.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/87125521752.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/26828109466.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/munobebonedusikogisafuga.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/bajibimowimebelubaxaxeze.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/wepavukoxamagad.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/lepawepivubirazenegigutun.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/sedonumane.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/wolufowe.pdfIn PDF document text
    • https://servauto.fr/img/user/file/28505121309.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f21dd55e79---244214029.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13684007a---tomerasi.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/37506525812.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_off0000bd91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD91 10404 bytes
SHA-256: 99155ead7f1e089ca1857b7f3a729366ffee9766be3882cb7348d1184de40e88
font_01_sfnt_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 16728 bytes
SHA-256: 668e467e5fb67398e47b9b9422fd16329c5ffe4418c0892ceda4562d242c85ce
font_02_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1