Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0161ccfc80f71e…

MALICIOUS

PDF

79.0 KB Created: 2021-08-17 03:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d656fe7a2715145f2c39a18cb8201846 SHA-1: 5d7db5c7a2afb2b64df58ec2f1be792be7f2f24d SHA-256: 4a0161ccfc80f71e5f41199b35f7f8be39727c02f80bd58f003eb2fcf9e5e423
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of external URIs and link farms indicates an attempt to direct users to malicious sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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://chcial.ru/uplcv?utm_term=android+instant+apps+downloading+automatically PDF link annotation
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4914d57473---winomanuripasubatu.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/14f8cf1ef98d26bc8252930799ec34ec/90833003997.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/norunajuza.pdfIn PDF document text
    • https://esz.jp/img/editor/files/tesikazoduxevipi.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607633cb28c93---34055569054.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8529caf131---mitorovizumalar.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/fatufibosutinikivejuf.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607797779ed76---59440896850.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/63884361961.pdfIn PDF document text
    • https://fasaac.org/temp//files/95056319414.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/bebaderedixafinapemuj.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2abb758af9edf2cc475154fbab0489d/96823202111.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66202213210.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xubijevuvewogarataj.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dkp87oh7r62j1rma9oobon0nnu/kizesenolijimijesuberisa.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/71304975002.pdfIn PDF document text
    • http://kotolantopeni.cz/file/34598399868.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/34382449197.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vabosoxesurekuvajaf.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/1e719e1bd2c67489a441b4c73c8fe588/riresurigini.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/c2aa4317ea37d8962f05c2a3801809de/41527007933.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/mnruv1id3og8ju5q7ov8parcmg/92006909316.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e0ecd4300---86646389512.pdfIn PDF document text
    • 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_off0000e179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE179 11004 bytes
SHA-256: e09f6f3d61ffa5451a031e39a35066728949beec2460068595672d02295b0c59
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 17556 bytes
SHA-256: a55ebecdceb3c4c4f02d1d50c559765d0f8b50f942aefb6ed3159176179363cf

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