Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd496dce264494a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 14:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8cefff9c4a5c6cbf5184abe376e24ad SHA-1: 882648b5d4c309803ccfa8330ca98f98fa83f4c5 SHA-256: 9dd496dce264494acff581b6cca74e9f990ea3f280323b69d66aaf1fa475e845
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • 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 https://ofcourselc.com/admin/uploadsfile/55123400949.pdf In PDF document text
    • http://ipceurope.eu/assets/file/kikofewafuwukabudag.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/51037336258.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18a49d374---debur.pdfIn PDF document text
    • http://webursitet.org/Files/file/63657711675.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/49155931515.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/53478912328.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/86638332645.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/95158418773.pdfIn PDF document text
    • https://edinburghpools.com/contents//files/beveni.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cca7de940f---74118982438.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ia838d9r033d6m8bmv3k8p8069/51407853255.pdfIn PDF document text
    • https://plasy.com/uploads/file/90598174881.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/kerivugimosot.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/lekulenojiw.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763bf5a88e4---57901823307.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e47665ttqs298stshbf5c6e51j/59811905594.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f2f8rq83j2cr2fuacm4udtsrkm/sapag.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/salevur.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b67b34f6---49865216517.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/mudebikoga.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099429d0cb17---20664773389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=factores+de+riesgo+cancer+de+prostata+pdfPDF 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_off0000dcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 18884 bytes
SHA-256: 98e9d9d08af2f912a314f1e4464cd9cfc544b7afbe6616c18373367f6f0f5614
font_02_sfnt_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 10728 bytes
SHA-256: 93206973119dbd368d17dfd2f70186eed2e04fbad1d1c1c399ed5832fe4fcc2c

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