Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32c8e8abc870afe…

MALICIOUS

PDF

72.9 KB Created: 2021-09-05 21:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0ec55c4b0f618f7404d048c5d9c0fdd SHA-1: 41b81084380eaa2535d5a55cbb426d78a459fdd4 SHA-256: c32c8e8abc870afe04c9d4d07975fe508a624811b72ca034653bc85446b8d212
164 Risk Score

Malware Insights

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

The PDF file 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 through these links. No scripts were extracted, and the document body was unreadable, but the URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=dna+model+analysis+worksheet+answer+key PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a185fa110a3---81676973556.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160836b1266677---41494429033.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/95936698891.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/92926838688.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5b173bfba---wewoxixifudoben.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/24406711658.pdfIn PDF document text
    • https://infypos.cncmonitors.com/infyposcms/media/kewekedorigevumawu.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/cee5e9137a441a4b798b13b2cc02c5aa/55754609396.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096adf492900---16405394541.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/4b9860f928ae33388c2521cd1d666a42/xuson.pdfIn PDF document text
    • https://polandpools.com/contents//files/30191088278.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/vumegonavu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xugelusorovuxator.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ft2q2mlmmj33utqu6ohr0tg7k6/39826475808.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/78973598220.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/nulojenerezobuxivow.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/88383055056.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/65935481711.pdfIn PDF document text
    • http://jarosi.hu/files/file/felizolomevufoneteka.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/88356818415.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kagetifuloxukov.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160f5060288c7e---delabiwa.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/59362192282.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987e89d2276---fudefodivawug.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_off0000b92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13D 17156 bytes
SHA-256: 3484a1321d5d2de40d701112713985ed8a26e42f0e0c35489c2abc935ab8a40d
font_02_sfnt_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 10808 bytes
SHA-256: 5b49fe6c8cf138d7eb96499ca160abbf9f5d93ba5ab04f1241b579e6ab01ebbc

Open this report in the interactive analyzer, or submit your own file for analysis.