Malicious PDF — malware analysis report

Static analysis result for SHA-256 731aa231ca4b4470…

MALICIOUS

PDF

83.2 KB Created: 2021-06-28 16:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b0adc1a078bcce9301731fb8cae26529 SHA-1: 3c72c00301aed1907eb07972780766c76ab0f760 SHA-256: 731aa231ca4b4470017116c349c65f15f29dc3621f09aa5171f4159795df5b30
64 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3776

Heuristics 4

  • 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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7107853530d71bbc228745752dda7e26/38842223592.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160799cb9d6d16---75414466387.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7957d82dd7---98136814321.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/20828678934.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34bb35e75---75027316789.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f591e04b---2601466297.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076849dd04d6---87254971492.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609642371f40b---58910777621.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/55761655399.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/fivgr2ta48mtec2qvptgcspg6l/44441156821.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/vafibega.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e6508bd61---samukesumodaner.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uojoqbc9snrdrq0aqkkqag7r01/6493851388.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd8d552d9c---wewefamasiwupep.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a62aa0a26---telusopudegarol.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/80351961100.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/muvabodagituxugogifokib.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd39e78631a---98984950168.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wubiguxubabugi.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecf6313fec---8416278830.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/34495196878.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/26841511428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=240+kmh+to+mphPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6f62735666f03f2a323c6f67d919bbfb/32015778767.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_off0000ce4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4C 25556 bytes
SHA-256: 94c5632a02c73593e27e9bffbf9b4c6001e065a7247ef7cc1134b1c213e5bd47
font_01_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 16564 bytes
SHA-256: fdd778ee6ed24f532702b9084c30e1d56e491305559c60e6ff4fb2027a888d96