Malicious PDF — malware analysis report

Static analysis result for SHA-256 238b1ebf2aaad9b4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 08:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0e2fa4e3c4b53a6e4098370bd58dee5 SHA-1: 113ab4569000a6c9663190eb273a2faa5656f21d SHA-256: 238b1ebf2aaad9b49b285566cb977d54a94a8a704a3c8fd6f409520908e60318
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=synergy+2000+manual PDF link annotation
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe795e86f---sebanibidorabu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96d2d52ff3---mobuzoto.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/sirewoladitos.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/26450096538.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/75383575496.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7699fbfe73---17657109589.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/18879447852.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/b27096af708019ef26a0d80687bcee00/15967185702.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/fa4cda66a4efdd620080ded459acc230/19706260416.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/93207811070.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/zemisurisekiwuwezobeno.pdfIn PDF document text
    • https://atl-50.com/files/file/sosupi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/60382023131.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/jojokuporiguroxitopuli.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de8029f43---mimojiju.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/kekezisar.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7dbd874f9f91373143c8beab59de9da4/xigelevamoxasugodage.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/vedarivisotokes.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/feburowexokilak.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/19588385985.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4c56b91b---vuduzivij.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3a83fa09---pevibadejekonosiserarawuk.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/31689046665.pdfIn PDF document text
    • 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_off0000d945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD945 17968 bytes
SHA-256: 75886aed3d465523127088d14cdf1fa932043309a94715ad5f965886f67ae738
font_01_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 10504 bytes
SHA-256: 4cfdef2a165b3d635ada39a093fedeb71575b451f09e60c58f8b42b3e69c8b23
font_02_sfnt_off00011fd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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