Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48a52c43df70378…

MALICIOUS

PDF

62.4 KB Created: 2021-09-27 04:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 26dbc2036e644ce333845b45edbd4299 SHA-1: bb8a8e96ec3a74d8c61677ad2c44e2be0103f0fd SHA-256: e48a52c43df70378123ea571302e3b1073be70970a19f8f23bc0b691210999ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5920

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 http://kazuma.ru/ckfinder/userfiles/files/zijedafejesunu.pdf In PDF document text
    • https://saigonservices.vn/images/uploads/files/36977358859.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded2e23677---39426864464.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/e5a5fb9b58f85cccdcedffd743984eba/71297919360.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e0c3a5f36f---nijujafumigisobep.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/zetojoxigul.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-15/210915134320919891kv9pf2l4esah.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/29018175531.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/98498922822.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/61330235740.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/1423274430.pdfIn PDF document text
    • https://atlantidegattico.it/file/18864639042.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/69721438915.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/67701406915.pdfIn PDF document text
    • http://kientam.info/uploads/userfiles/file/39554084489.pdfIn PDF document text
    • https://dukupahit.com/contents/files/17647393807.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/vawiwebivazizononaku.pdfIn PDF document text
    • https://latework.cz/soubory/49245118028.pdfIn PDF document text
    • http://sireny.net/share/files/vomanamodava.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/17130872938.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/89408194054.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/3156604667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=play+earn+to+diePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F2 10188 bytes
SHA-256: 44752f283b4168d655aa89571968b5031ef600c915209b15cdc98d97ce848ba7

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