Malicious PDF — malware analysis report

Static analysis result for SHA-256 129401575235ce67…

MALICIOUS

PDF

97.1 KB Created: 2021-08-17 02:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d3b234b157fbbf3d7f8ace68b99bd8cf SHA-1: 5a0b34c66f710e37d8f636016b2f16df808fee6a SHA-256: 129401575235ce677152080c71c19108cc2ace551500799a04f8a47948125afe
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ClamAV with the signature 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malware. The document body was unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3987

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://eltonltd.ru/sites/default/files/uploads/kadulazupijogirubixakamup.pdf In PDF document text
    • http://jingluo.net/uploadfiles/files/fupudanavesuvotob.pdfIn PDF document text
    • https://kristinanamaste.eu/files/64244381237.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5a5bc9b20ea0be66e89c584c6a526f46/lagakajopa.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28fdd8f16---86327845541.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/354bca7af77786239f813c4974ae2f3e/tusosageku.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/gazerug.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ec3774fb61776db3be45b5cdbbb28fcc/95688550099.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/tavadotunijabemadufi.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/83173212761.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea0e86480---39595797402.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa631c787df---geninanumirubutowajame.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/dexupamijubipevi.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/sugowewokadewixujazosod.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e7us4thlf8tfhgne4b76uqa35n/71195132613.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/xeragutigarajojorugenu.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f33f917f1498b9fddb84e945b880a952/5763070138.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7af03b5a6a21ab4d74b93cefafefb94e/78788940357.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/bopekopefuzabebubupaxet.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/59904032745.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608529cc8b5ae---lakubejasu.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/batudatefizonoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=skyrim+enb+make+nights+brighterPDF 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_off00012af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF5 19132 bytes
SHA-256: 52d4302926f02fe35ee991b9bbffdaa0c5f1707658b6aa81f02ada5722aa3eb0
font_01_sfnt_off00015cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDC 10812 bytes
SHA-256: 89d12edfbce0b511c8a2a84385ea6726bf24b46f250e0e0be214dcd948ef49d6

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