Malicious PDF — malware analysis report

Static analysis result for SHA-256 b25d13c9d64861a6…

MALICIOUS

PDF

112.0 KB Created: 2021-10-07 17:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9e266f1ac88f933777bf4bd7f6cf0067 SHA-1: dfc982a1949f96423e2b0fc76b1604ca0f03c886 SHA-256: b25d13c9d64861a62d391f5ca7f060c288969e1447ce86b6e769f4eaaebd6c1a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV with a phishing and trojan signature. It contains a significant number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. While no scripts were extracted, the presence of these link farms strongly suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.1317

Heuristics 5

  • 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
  • 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://easternresources.net/ckfinder/userfiles/files/jinizimak.pdf In PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/78826145520.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/50600633531.pdfIn PDF document text
    • https://betamachinery.sa/other_files/File/niziw.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/dewewedatowu.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/30246672.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/50047533080.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/2263874610.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/7576588797.pdfIn PDF document text
    • http://melabo.com/upload/files/11469913780.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/guranokedubojirugerasuni.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/wipugevijuludimumetoz.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/56915814098.pdfIn PDF document text
    • https://fototipia.hu/files/files/papigopezedoru.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161590da2d45f9---50357402780.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/73455072565.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae2d52e1c---98292818594.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/17686431374.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/gudaf.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/medimuwojuvunudorabex.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lofonusel.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bdc6511f---suvesositararurufafujuku.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/mojujowunuborutavewatu.pdfIn PDF document text
    • https://thehouseproduction.net/file/22523669059.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/71092336052.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13588698682.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/dogeredudoxuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+philosophy+according+to+platoPDF 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_off0001735c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735C 10768 bytes
SHA-256: e6b432c9916702477f66d013b146bd075dc7479fc2c4e2ef1066ed1eb2f20d86
font_01_sfnt_off00018bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1