Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c03ff63a275f2f…

MALICIOUS

PDF

75.5 KB Created: 2021-06-25 09:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 88a7a82a09d27f125add9442603bbad4 SHA-1: dd9f5663731f9701d32d944ad7dae251eccc3936 SHA-256: 94c03ff63a275f2f46cc15b15194cbce1c9f03661a7a8f684292179510169b4c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised WordPress sites, identified as a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple links to potentially malicious content suggests an attempt to lure users to download further malware or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94f4bce324---kituze.pdf In PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/55310185889.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f3b29a377---82908460598.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbcdc52f16c---24412302255.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/lunulazan.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960ead8d99f.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/7921438698.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/85864088840.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/falelasapagu.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/kasilisisubatiwimas.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/tefib.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cbf7360441fc0b08940495385c7461a7/21962317943.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bd80d226---56474325551.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/74f66ce3gpule32khi062q6kmj/refixigazemi.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/8541033924.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/66760555707.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lg+305c+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB43 5216 bytes
SHA-256: 5667d74e454a67b714e37ca7e932248166fb853bd83015fe5473c966f76726f1
font_01_sfnt_off0000fd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD06 10604 bytes
SHA-256: bd0e93b18554e3fa6a8e17f21aa694236474ab6977a414ba61ad443b8687d423

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