Malicious PDF — malware analysis report

Static analysis result for SHA-256 d232dd99eb6b9352…

MALICIOUS

PDF

88.0 KB Created: 2021-09-03 12:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 856da9fd0bafc585b205430df461c881 SHA-1: b41a85b99f11155ed0f2cba28b2c74e1b12b35a7 SHA-256: d232dd99eb6b9352a6b22f06e24ac009d97c67234ce50e1437bb5e01977246a9
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of redirecting users to potentially malicious sites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tavio.ru/files/file/82918991434.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/b7bd553510d759b7a4dc5ee7a76969b1/dufumezabubojiraku.pdfIn PDF document text
    • http://wych123.com/upload/files/nipagusijumas.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e3a17b3e0---80634531267.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/89275c679ea1eb5e4a0ad66d0da90636/9900381483.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/76727141423.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/63sdqtg9r69e4qjtqjgrksum96/wekaxomupusubiwugiwa.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/68ljep7j2j0dcnm0mo0u5i6jep/25323758849.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/fipusivusafetefobofu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3848b8sddn4iq5o8hvf15uvj9r/verejar.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/64294220653.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/25987539006.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/21ms52on84gsmn0rlimoiel3bm/zuxasemisojakuk.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/45675409672.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ebbea0041191dc2b09b08c504233dae0/262998698.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/58903324099.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/nebejut.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e40b78bb---67802000429.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762e06c7d0c---kizawokuvotiwu.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tejatudokemuzifijavujod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=think+like+a+monk+jay+shetty+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d30a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD30A 18060 bytes
SHA-256: 0e9808ce7c21ce348e44ffc15b5bdf4622058703662b51fb0b3cb037d420833c
font_01_sfnt_off0000ef92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A9 10960 bytes
SHA-256: 919bfa97cf7566fc7ad612b15bbf8daad67c5dcb26e538be4b372e4dd075c3d7
font_03_sfnt_off000120da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DA 18816 bytes
SHA-256: 437e88701e493b188e94fc3bd9d51a49f8892ac3e58db6978809d9022670db6b

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