Malicious PDF — malware analysis report

Static analysis result for SHA-256 728fcb6c712898fc…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 21:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4d59ae1bce2533378405986aa4c670f5 SHA-1: a9ffa5458671a9bf899d61339a3cba7296e3a34e SHA-256: 728fcb6c712898fcf338a69f53bacae9544914461b3cd142cb31cd1e22db5fef
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8driqd7lm7l0v7qmjq1e9sk7t0/91022523272.pdf In PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160854d667e913---34275399803.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062906530580554.pdfIn PDF document text
    • http://usmleworkout.com/files/file/74896691373.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160802a8b805aa---77553395465.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608470ae88f12---8685847386.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/bojeguvajip.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe677ebd4---31657486307.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fb4f408af---38759725012.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/69702145047.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/84518087277.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607480a17ee90---95451784612.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/najidubab.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa4ea68b5---guguki.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/modugokimulibojulekojev.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/8dc57800626f1e7a6bc20c4378d51e77/92790686432.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ou01ishcubcug5p2l7v9263rt/54836172952.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/9866454429.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/5bcbc990db069f9e5cf25b948a14026c/jotusosozasedut.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/polojivasugusokamalefibar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=definition+of+gas+lighterPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 10492 bytes
SHA-256: b060e8a852aa722d0d86f4d3d22400fd029190ade93f2e6102404a5d268df75a
font_02_sfnt_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 16812 bytes
SHA-256: 7e337d5a6edf6f2ff77d6535745d136e993f3b27f24479c3b6cd26921091162f

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