Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dba82deca70b69…

MALICIOUS

PDF

88.4 KB Created: 2021-07-10 12:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 032a20c0434d2b4d8265dc36867c116b SHA-1: 1f620e88ea3418a150e38f5a180509c43a9bf265 SHA-256: c1dba82deca70b69b3549e8fde124482513fd6f419d80698b0fd54b1567f473a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript indicates potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kursadowicz.pl/Upload/file/49434485355.pdf In PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xudidinuxob.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/44234867607.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/47354117206.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/cf44e13fc09d6ffc950fc4bdec3863f8/96695629461.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b2fb59d7ded8358f4648b1444c8590d1/15320088488.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/bikaxuririrudupimamito.pdfIn PDF document text
    • http://bakoca.hu/files/file/78376157224.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/40360363762.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/16915768727.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f5e0e873e161c17b9c714ce505575736/58201706484.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ecf031f5db01062e827c996a7977e94b/wefuvevunamot.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/85864472386.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ggu78jf7jqroh67mn5sevjqao4/10141053098.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/3a1e4f377540446b489e4149e7922aea/11076253748.pdfIn PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/78594980920.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210508211323377937xgh199.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/31095663949.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b03f4674e0---81039330122.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd14ee9f6e---pudogoripuwolulitudo.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/12136464654.pdfIn PDF document text
    • https://soechi.net/userfiles/file/61457566688.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/dorifigabi.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8c503eb68f2d66ef3da48e087f4a8c01/terinaxeguguwatularilu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c010dbc6e8---86108127585.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/30752460563.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/84747251286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+meat+necessary+for+humansPDF 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_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 17308 bytes
SHA-256: 1d182745409c6711eaa9b67bb9627aa2795246fdaef9174940aea88bc79f1bf3
font_01_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 10628 bytes
SHA-256: bbabe50a30561317188a25f626bde6ee7e6f878e71cde689517e474c71a19f7a
font_02_sfnt_off00013c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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