Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f329c8bcf04372…

MALICIOUS

PDF

97.1 KB Created: 2021-09-08 00:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f32b37e41c27ba69f8b97ffcc7cf61d6 SHA-1: 74b4d553110998582fd22f5f6fafaf58bd928340 SHA-256: 16f329c8bcf043724b2e9e543312e7442e3a2a7f1e5dda1178992f6bb3049a88
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document is intended to lead users to malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5517

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 http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094698155809---dilemadexalusapepaxine.pdf In PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/63836109146.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/6995329875.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/duretuzutok.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/92761657742.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/4182ace07f48d072990db6ad1c7f81c3/xinepilofode.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210807_084744.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/lanolirikavalitejakivugex.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fa5afa7eef0046200b677c35bc0950fd/rodatogesojujopokir.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/68555931537.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/84269796216.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/gujuwukoxof.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/df60esnp0mpnuaslppcm81nfo8/sowibi.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/vevatabutixanuw.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b14bf09042---rizozozubu.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/muxefegexuxi.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/45048704150.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/81776128189.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1f686d46---zomizem.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/t11v8pef6pjfc2tcdu1k4kojm4/sarodi.pdfIn PDF document text
    • https://dintek.eu/uploads/file/lubaku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799227646a6---49721419315.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f82230a2f55---famiwivebeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=urban+areas+and+cities+act+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B95 20104 bytes
SHA-256: ca7791a8d4630630c7da129032f6183c4943283ef1a888b909d53402449aeb65

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