Malicious PDF — malware analysis report

Static analysis result for SHA-256 2506bfbd1420077d…

MALICIOUS

PDF

74.6 KB Created: 2021-09-03 07:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07b8840c7d6a65c20f7393bcd9badede SHA-1: 191284c542ea1290bbd7105fcf0b309e8168ed9c SHA-256: 2506bfbd1420077d42150f11023cdc4b084e300abc15ca00a925e3199c0832ea
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of multiple external URIs and the structure of the PDF point towards an exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cd2c69d39fec2c63688e1df2d88a1c56/47085605486.pdf In PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac16831e0---xemimibegeropexu.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/30690177489.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/63196798905.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9134jr68uquhme66r3vocubah3/19423080812.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/rutipepudegaxaxisago.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/retex.pdfIn PDF document text
    • https://sharenkon.com/files/89990976047.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/runapokagamum.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/79472617045.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8d9b7a74c---bavamorilijesaped.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/vurolewirasamabetigip.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/tawomasizitirevavibolu.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/kegoxulunazasu.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80721420c---govemuvikugusilegizewexob.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/simuvosizifinedatasezet.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd8aa69628---86710517508.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/77082094917.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/povimenoxeraja.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/b58aa910e18c043455c8b21d9556bc27/61645081140.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/25998033208.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd7de2272---79495318305.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/56729132074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=trimble+s5+total+station+manualPDF 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_off0000bf38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF38 10608 bytes
SHA-256: 24ed4f12be19ab77fe1a48ec7cb786bbb55aaaea3524444b53feb20b1f5b8ed9
font_01_sfnt_off0000d779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 17580 bytes
SHA-256: c9919c693fbac994793b7241f3d8b4876fd18c135fcc821780b1e5dbd14725d0
font_02_sfnt_off000104aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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