Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d0f4e6091d9194…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 06:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0bb57477e72131d4fdd8216c69dfb26a SHA-1: f7d5f4ba6efaf07ed515494deb19ee52901b0722 SHA-256: 25d0f4e6091d9194d2afb216f4a515152024e72eec9fa8f8cee8722d7e1f7ec4
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised websites or disposable domains, indicating a phishing or malicious redirection attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of link farm heuristics further supports its malicious nature. No scripts were extracted, but the document's structure suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=negation+fle+pdf PDF link annotation
    • http://falerisztika.hu/tmp/666791552.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611f649481cfe---97269811592.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/49196710452.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/gafujexebisegudab.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/fd27580bf961026bdf27734c8d9b850a/nagum.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/zikaziponanizarad.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/vkl0epshfc013cmmm5kcif0jo0/11917221009.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/dapomozigazetesegefuna.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc1179f9e---69445738936.pdfIn PDF document text
    • http://packamate.com/userfiles/radagiruzudeboxo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d93f0eba---funitanezugopaxalar.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zebakozebi.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/98514737720.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28731757852.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f70ec9411---sokituwa.pdfIn PDF document text
    • https://vientangluc.com/upload/files/92047516589.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j173qnosb7al1jffse5kt8d1nl/42323592319.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c76292cbe---vogewovuzevefogewif.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/473b939162c3128731f9da1849557836/dogizuvoxedomalevaku.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegelexubarojufeviwolij.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/fetupelus.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ce5c54ed---39056383471.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/jotobonumobixu.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/kezijutib.pdfIn PDF document text
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 21256 bytes
SHA-256: db1789a8808539de994e7b0973ef50b76ca68f83704dd41d6e09f88cdd68bb0d
font_01_sfnt_off00010ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA8 10384 bytes
SHA-256: a84b0d9896c10cd629c8bca28f1f95591c63dcf089194ab4e8e2b6981cb823b5
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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