Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b59476dd27c2a7c…

MALICIOUS

PDF

107.1 KB Created: 2021-09-03 22:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e7592b71e0c91c92174d8081c0746cc SHA-1: d555638884fcc5b14b9dd388dc5d843ce06144f2 SHA-256: 5b59476dd27c2a7c0596525d30f4c8213001ebe35185c858dcca033bdf68dcb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is described as a link farm hosted on disposable domains and compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the overall structure points to a malicious intent to lure users through external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://allytemp.ru/uplcv?utm_term=livre+d%27analyse+2+pdf+gratuit PDF link annotation
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07740b169---52722627312.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210722105345.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xipaxina.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/44279886722.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16116521f038a2---57734285803.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/97440048617.pdfIn PDF document text
    • http://fedoro.ru/upload/file/gadejigijenimuripopukakut.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/49691111127.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/42270847069.pdfIn PDF document text
    • https://t2sc.me/userfiles/kisapirawaboboxisu.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/ruzonuxile.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/s211kgnksho0fveb4pqt0e1d6d/namivitulilod.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098238370cf7---64005978494.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/41447706669.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/3b04fd1170de87823b179fd57613ab5e/vegopuzaxegajalobul.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/f874qr1mt3991n4ekrc1pqpl29/xanubuvuwem.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210607191541.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/99dd55a206303ba7c58591c20a586c56/vefevos.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/misezemitakubof.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/wexozujobubur.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c44622c0aa---newumopavefuwotuniwisavo.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/gafiwakejisilaleji.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/kutipuvibolidileru.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/damekadip.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/36843312465.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0bc42013887364015f92fbe02a2fc38a/23449245787.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_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 10944 bytes
SHA-256: ddb5f7ff197efd5ad7e09a94f518d5def505f58aff298333f58de7b856f4ac26
font_01_sfnt_off00014a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9A 22644 bytes
SHA-256: 589a568fd67b3e94bd9c5478833689235ec20d57c0dae08fd0b62234cc7e076f
font_02_sfnt_off000184cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1