Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c3316434a6d15f…

MALICIOUS

PDF

88.9 KB Created: 2021-07-26 12:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d74dd240b89031a86c0956a64549507d SHA-1: e6c099e974642f1f573c16c2565f2e9320620190 SHA-256: 96c3316434a6d15fe747f025791d72188dd5d17048bda6201807fd647c135ec2
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the document is a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160dfde842e2d5---kekamozokulusiral.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/433b2d0d6cf2f304c8512dec3e2c6ef9/rufefulubojomulikojone.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/26658250959.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/17c81c5d5e1bccb024f84a3b664ee23f/pemavixesupiniwefov.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/nagupoxobilutowo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/vozedes.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089829f3f681---17338468785.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea098c5d90---25063767094.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/d2a81623262fb824d79e85b664a619da/jifamakexugadenos.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/da16845e3addb1056aba19d2a4744599/87570600097.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/varexu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98eb5d5bdace9b3a5d3bcdfc6c0a22be/fufotivujev.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/98284115726.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/rarigimimego.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876e716b827---kitezuledonafifale.pdfIn PDF document text
    • http://ozari-ua.com/files/file/20252495041.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/jixefujuni.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/burupitugesajulewenuzita.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/73467079523.pdfIn PDF document text
    • http://nakatka.com/files/file/pixagasolunejepukix.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/66556488520.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/luvubojoriwikupadonakozed.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/pipebibapafamulolubizok.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/0aa3615bbac8aca9a651ecf3f6f86dfe/65625487948.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/removonipe.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8m3oh373kqbof889i786kdvne0/19128569014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cevdet+bey+ve+o%C4%9Fullar%C4%B1+pdfPDF 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_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 10860 bytes
SHA-256: ecba4768c592ef95dc5a60b3e2cdc4faa32065866379619717ad0d5a70ab64f0
font_01_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 20192 bytes
SHA-256: 90f0710c0dd3274f8c4f272fd1a380604f7719f5d494e22104e50d727eeaaf34