Malicious PDF — malware analysis report

Static analysis result for SHA-256 be288310a5f1f85d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 13:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a661e50dd3340f8c9853336e94ac3d1f SHA-1: 9f7baa8daab678df521bd4b9e48ac0c97dbe2277 SHA-256: be288310a5f1f85d0b4fd3c3ae67bab16760955b17dc1d462f318c561a82855c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/9cff5eacc37c3085c9f442a7f9325c16/lalulemadudurokiko.pdf In PDF document text
    • http://bookblog.kr/data/file//files/76796801655.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2736c3f860---lopewisuwonibi.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/3364972842.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/87d105e12fef509418fe3864fb97ca61/lufuk.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/50212595cdd14ba6d98c71abe4ad5085/27269108282.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/lojuloviroxuvaxev.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a6e25e203---bogawiwozikivobux.pdfIn PDF document text
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/kiwipo.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zupolozunufexis.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pudn23vv4dao4v2586qcopor0n/tokemovazi.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/tugakaresujig.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160d75915d669a---57377344058.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/14d2c4bd839b7582d35255f27a433be8/kamed.pdfIn PDF document text
    • https://himanshikitchen.info/viking1/uploads/files/23813554994.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/tepuvubaxitaleripa.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/50254782281.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160bab0cbb8cb2---bejaxupofakonizuvoji.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a8ba278238c486517178b56903916588/zuxuvenoba.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/70707ce55b8859486cbd6133781f03e0/siragimudeses.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/20107242090.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/47sfl5h6eltajaagnr5i9fd6e4/50736802066.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/ai886f862m036hr8tvd8hg1ta5/26995521518.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/92bc41602b1b31e0d11dbef7becaba42/42852259430.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8947ee18cd---baribedimatixurinugu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0d8a7dcf---takabuxawowusovujidag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=razorback+greenway+map+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://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_off0000e2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E0 11096 bytes
SHA-256: 3cfa9ad98346768a20ab165e55cfa6c194180f481db979a05da2c7d2b720a1a0
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 17368 bytes
SHA-256: 39d1783500dd19010390dcf8fb41b0c79f8c9268a7803926ee2a5690c931707d
font_02_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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