Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be6b8199d60b0ab…

MALICIOUS

PDF

80.4 KB Created: 2021-09-03 21:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b55c3397a64d8e3847513912430b6291 SHA-1: c9d100f93eda51258a964d79efee51e49e53715a SHA-256: 0be6b8199d60b0ab88292fcc5757d2661c55f8127a3f4fa1ae5288d1d4f7ec5e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://akwarella.pl/user_uploads/file/62453376443.pdf In PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/13422143710.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/tasusalovubosebopigusufet.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/30938319349.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/zarekuzuzilotom.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/tekel.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/342093c6d151ed124748c04d745c613f/vuxoxosafoveviwob.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/66650eff010eab9527f6ff1c24aebe35/97795496637.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/gigorirolizanekevola.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/89175965647.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tuwavamajozosuzujamebagow.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/53246311196.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/85483853171.pdfIn PDF document text
    • http://mfahk.com/upload/files/8558173829.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/df2d6kutti0ar67p1cqfs1d5k9/82216602966.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9bfacad2---90452099218.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/53542151954.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa0065e6b---pirutalukuwewudigidox.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcd7f6e50d---wobexezigexifanisukala.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/bejipovututexime.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/nenakupe.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/87775855590.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/f2ca62f4f522d54716a0c3d85f96db5b/nunopimuruzepejotugusuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=pump+jet+propulsion+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://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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 10728 bytes
SHA-256: 0a1cdd7261af49d88e8e04f66f9744843970cc84c2c4e58f263720691fea0a47
font_01_sfnt_off0000f1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C3 17728 bytes
SHA-256: 25c583d3933bc49d9327bc6db018ca9afa2d650d2a597d8f5b14ecd8f730139e

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