Malicious PDF — malware analysis report

Static analysis result for SHA-256 992dc25612fe549b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 22:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f047514595d685931ea0b65a26d957a SHA-1: fa321892d8188a94f421b75e594a4722fc9d31ea SHA-256: 992dc25612fe549bb829f97299df01946c17aa755aa6f09d81cad8fc19422fc4
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The embedded URLs suggest the document's primary purpose is to redirect users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/a6b853d6711968e2ebf131f8c69651d6/gigebetewirap.pdf In PDF document text
    • http://fsoa.cn/userfiles/file/89994049492.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8553ab7f6176d4c9d7602380a7ee5ccd/gowexobonirigomuwewa.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/66729392949.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kidebunax.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/sepuxewefelajanidega.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ni06c1p7aqi50r8jdd068t6loc/977341331.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9cb50c1bfd00eccec8eb24e40aa1155a/retililated.pdfIn PDF document text
    • https://micsys.in/userfiles/file/joxadozoxutirituvejarug.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/bejuzareke.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f109e477---rasep.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210805061443.pdfIn PDF document text
    • https://actor-conseil.com/files/file/68490157472.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf213df9f0---gotopop.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16074190e2bf62---nevajosaxozuragus.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/vikogev.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/29464117571.pdfIn PDF document text
    • http://jar-ted.pl/file/76912162919.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/72f8b6c5a407c4d82a2f11facad00a8d/tinel.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/6144084760.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/86044968766.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/diwuvokesilivud.pdfIn PDF document text
    • http://rcot.by/pics/files/13629250235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=english+file+elementary+third+edition+teacher%27s+book+pdf+freePDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DA 11428 bytes
SHA-256: 7685b8aea335b5474d0e3b7a0a4abdd379399e0bd86bcb6e722b243ddd56baea
font_02_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 19768 bytes
SHA-256: ad45e17538508b02b92ecbc526fe5d845833352585eacc6d1ba8e763f97316bc
font_03_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 16396 bytes
SHA-256: fe170ae82735658a3e1890d241c17d74304e740431117b662866397a06a8c521

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