Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ed690aebe3bc9d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 22:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8acd0e55f2deb42c9f180722b5520b6d SHA-1: 4f83ba54021cc1106a761301be5b35a8e1000f6b SHA-256: b5ed690aebe3bc9de9f1709bfde2c793049682ed6e7da7def0f782c673c3eb49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Some of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://libertyquad72.fr/userfiles/file/rapuvedesurojupufezitup.pdf In PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/85982508207.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/pevit.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/64143242f508311ddcb2cb24631e25de/44554337501.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/tanubijuwabewepitezoboz.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8a23eb35---jeweparenalenupotidamu.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/36754925169.pdfIn PDF document text
    • https://stichtingech.org/ckfinder/userfiles/files/vikobibezusodedas.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/90423724923.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/71593802660.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tiwimemirupeduwoxotew.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/vanojotanof.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vonepobekijolezasav.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/jibojijofedepukisarij.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/kuborusugo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d8cdcd0eaeeb29f6b51525810b577a04/fedogilamukenor.pdfIn PDF document text
    • https://comfort8889.com/upload/files/jorabujokuwoxudoxusipe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d4cbb6b4e---93421312680.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/33104315741.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/joxotibobijadufuzivomije.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lq5rvb5oklvu6l5v42kjb2cis2/lavivim.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210912045918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adb+interface+windows+10PDF 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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 10804 bytes
SHA-256: 6aeb3986aac28af1f822e64b6125bbd6a44bff2e20fdcc3902a410031287e581
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C9 18124 bytes
SHA-256: d842ec8d766d104f5b3a7e4fbf6bbeb7fda654c5bea6f8bd646e8407f990cf1d

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