Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c254bc40896fce4…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 01:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4ede2b9f83575e9fbec84a054dcbf18 SHA-1: a724761d044d9024bc2835aa4baabfce2d7b51eb SHA-256: 4c254bc40896fce441fe39834c703fc17500d24b6c70eb2026493024a15cbcd2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 5

  • 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
  • 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://medvor.ru/uplcv?utm_term=how+to+install+the+play+store+in+laptop PDF link annotation
    • https://mvmdigital.gr/files/files/dejarukutipi.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/27041016602.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8388541e172444fef488fad1e15d5641/80462873167.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/9907730002.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef1de8f8fd---wukaselalito.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/32650262670.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/78618917372.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/dusimeje.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/leriselarutejoresepiw.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/dabigabijefuvibuletemine.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/72704523101.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/gowesiba.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/39812125449.pdfIn PDF document text
    • http://househouse.it/userfiles/files/42581708378.pdfIn PDF document text
    • http://kite-surf.sk/files/xesazetivenudeduvufox.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/73415368667.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/koxipolusiw.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/61659836416.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83ac31f3d---magibiwudozopum.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/pofotofipisagazevulejata.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9f52dd57.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/diribexexomisi.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/tivulaxemugogugerozon.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/94677676503.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2B 17824 bytes
SHA-256: 3a4142ed9b89be74903025a4cc7328c896b45df27a9f68631bdf3f2cd1b20934

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