Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b51df93bb07514…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 18:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 618eebd8e3aa22281ed3f208de75bfd8 SHA-1: bf9ba420600cacc834fa933adf206414f5863223 SHA-256: 35b51df93bb07514674e6c09a20f1b848f68103014b0db49fb3feca421f88883
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised CMS uploads, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://goteneplast.se/files/images/file/174324546.pdf In PDF document text
    • http://premium-t.info/files/files/fepezipisubip.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f514c59a9f5---lusaxovuwusekavu.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/22480508718.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609692bd45aad---15859142071.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/13551531858.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/19440862004.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/92839318509.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ae29058d778---98361699478.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/30223031573.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/20871067020.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/sikubin.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/26739701575.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f366c8ce8b7---7557460330.pdfIn PDF document text
    • http://kaies.net/upfiles/file/90498899792.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b6865e9b8aa662dc5e0fcf992035a450/rojulovuze.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/kuxowomeveboduzaxu.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/42987457150.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-08-12/images/files/23096769328.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e74366daa---31407123868.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8c30f0d2c8b38433dc33c66a8fa1f0f9/nonixapejebotagawagitazut.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7a014dda---bezikiturevezigiliwosene.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/mumifegokexazebasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chemistry+lab+manual+for+class+11thPDF 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_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 17888 bytes
SHA-256: fcf36b2971d7b261c02fa179066e718ee025bb0c3489ee63f86b3e3ebb14aee3
font_01_sfnt_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 11040 bytes
SHA-256: 571541e78e1344930578411d807d65129836743580634c7c661d7817d0ff4c3a
font_02_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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