Malicious PDF — malware analysis report

Static analysis result for SHA-256 3453d640b9abacb0…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 16:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0e6139ad990945b8e3a42be3a69b4b4 SHA-1: 2e24eeaeea682480fa21dd478d4fba0426409615 SHA-256: 3453d640b9abacb02af9735b3c7635c8b3fce5daa5ca86e1e5e9576d7fa187f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV and an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather as a vehicle for these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://jpt.mysmartedu.com/uploadimages/files/buvirafojezatiz.pdf In PDF document text
    • https://diedacorporation.net/freesiafiles/file/xejadomeroxodu.pdfIn PDF document text
    • https://stopserv.ru/files/file/lijavevowol.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16136e1e39e9b1---defotokewebape.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/vozagoxanu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa72d63b9---luzizosarufop.pdfIn PDF document text
    • https://melz-feu.ru/upload/49251358074.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/gaboxolenuvaxaz.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/85c6bed45d7a7755659d5b90ed17d9b2/fotoziwebikofawop.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/4637796282.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/lebaligogilupulukokaluru.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/34953799219.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/vumukiwigagerodiv.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ce04de6b---jezedelutewikufotogoj.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/31751416579.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/degujunofabifos.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/xuwisaru.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/jazijomoxuladaxexotalop.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/penezopudojudapanuruti.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161386b130450e---62976366309.pdfIn PDF document text
    • http://wami.cc/data/files/62438507906.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/47047253246.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30908940212.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/48191986080.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/sexewufiradazulabo.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35321272596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+divisive+politics+of+slavery+worksheet+answer+keyPDF 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_off0000c277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC277 16664 bytes
SHA-256: 807f917fa817f75cc8e8cfdd69a142cd6747e5e24ac5c87ebcc0c58c0a0d1d4c
font_01_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 11036 bytes
SHA-256: da86e8b4c5c2bf1ec1acbd2fb5168f1dda114163423004c2ccfdd7c7e363525a
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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