Malicious PDF — malware analysis report

Static analysis result for SHA-256 22556d31762bd743…

MALICIOUS

PDF

70.1 KB Created: 2021-08-28 09:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 039332fde7d23d51c5cd2f6a2efa89e9 SHA-1: 275ff99a0970b6d0bbbe8331f5c30991a0c7391e SHA-256: 22556d31762bd7439d04064f96d3bfb0926fd497f29e89caf45b35306463fa3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with several pointing to compromised CMS uploads and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to facilitate phishing or malware delivery through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nedirajtebosnu.net/userfiles/file/22730718906.pdf In PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/262750804.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/23906020302.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/mixufopap.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/n0bo6f8dckc6e2jp1ccvva6r53/dukuvetopojimoredibom.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/89036177275.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/22937453160.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2c75fcc45c20804fd068040d4cf9deaa/14371324260.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/maxixorimikezifiruzelek.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6fdc808c---74315803245.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df66d87b4---letipasotiborim.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d68c87169---sibopigol.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/96994963782.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8s8tqloi3iqs1l1l3iagfmdhg6/muvelitupetivap.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dsvp61b2rertenqhb1qgdhdp1i/20133227557.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/5672c3caf8596023cba7c74d535fe7a9/gotigulibubomerajizesata.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/26165751130.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/93068178828.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161234359600a8---55824262900.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/96734504467.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/56691059514.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-25/20210625212700630452.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/99886009898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=agricultural+ecosystem+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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 14492 bytes
SHA-256: 5a28384e0de7f74e7acfc386c592d789e66db389b34bf3d6786ce2e6f7ec7ac8
font_02_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 11052 bytes
SHA-256: 29384b183855a0371f1ffaa3edacdc95e3d53c585c6f24d049e0c36e8569da44