Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6171de9d9fbbd6…

MALICIOUS

PDF

68.9 KB Created: 2021-09-20 16:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4e2a4ed646100bd65114173d0388a126 SHA-1: 75ea1f98f6edc4dbda353d81aefe4ba709e6d33a SHA-256: ec6171de9d9fbbd645a497818f323ed737c4a9c138c9359c51f5b04cdb70b522
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://landroverbh.com/ckfinder/userfiles/files/wuzemo.pdf In PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/lakebejipan.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/bawej.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/21090807380580096993hng.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/xiletikevufobapoxedofuw.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/tixin.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f2173aead85c30df6b0869c6561bc0fa/gusagejerezazimefabido.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161383391de020---retupujogizetusametuja.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/90114027999.pdfIn PDF document text
    • http://thaide.org/userfiles/file/63164275249.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/84431686760.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/95408142231.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/polimaborotewoxam.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/vamipetafumivivili.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/jonikibosag.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/wekeperalomabutapiwe.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5f8661377f894022eac2a45639281db8/45849309614.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/e58b633c208f58c24070413a2e645f88/17168711113.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/wudivatet.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jorodifowo.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/45fb987cb90ad279048b1e4af2db4d8e/gorutejetewomewidofe.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/mukanuxipozepixan.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/sotinop.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/dimotivebodomux.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/zubusen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+version+12+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_off0000b199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB199 14604 bytes
SHA-256: 05ae39762d761f80862a955df717405b2a432ca4f690dec976c09e230fdc2d90
font_01_sfnt_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4E 10448 bytes
SHA-256: 1edea9e02855ff66ba7c1640075ca3cfc56a89e356a5dac823be4491600ada10

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