Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d2460264d5410d…

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 02:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8f6b514c60f99c5abc9f4d2152dfde9 SHA-1: 1d7449740f33552a1e0b5931c446cb2fcb978667 SHA-256: c8d2460264d5410d6f9f977a8ed231b338c12a379090710de72ae148601873c9
104 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms on disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking these links. The primary purpose appears to be redirecting users to external sites, potentially for malicious purposes such as malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=tamilrockers+new+website+link+2020 PDF link annotation
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/64044073590.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/54853699500.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd38a1f46---dizeti.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/vaboleguj.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/matujelame.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/ratowigalogetokawatadox.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/zuwosorawemuzufufoxefa.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/91748720004.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/botajuguxiv.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/jatifewejetulofofemepikes.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e77e26cb38---mifezesowuru.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc45a825b8---96182625670.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/fedugalopedanirezudakogo.pdfIn PDF document text
    • http://15881588.com/ckupload/files/roludati.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/tukibadebopok.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f9d8e50---gozasonofolokebun.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/13568247004.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/vepomekonim.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/tirem.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/5846147309.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/05c53e3c74cdf6c315fa453d693ab59f/25167300407.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/gutufowal.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/94180319804.pdfIn PDF document text
    • https://tdfstore.it/file/2215119267.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_off0000faa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA9 18428 bytes
SHA-256: c77b2a6b8b16f589e12265292882094c4eac7ab1da499fb43fc86cdc8bc947a7
font_01_sfnt_off00012b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B43 10912 bytes
SHA-256: 5ceebdb9a1d4444f611b77b12e10a75e7718b36d7a20e49a16a1954a7d6af701
font_02_sfnt_off000144a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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