Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b96b9bd1332184…

MALICIOUS

PDF

85.4 KB Created: 2021-06-30 10:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01d4241b8dec1785577c92052c18fee9 SHA-1: b3421998fd29d3585bc408ccfd480094350ac011 SHA-256: 25b96b9bd1332184b7e5401a459aa7f5269b3cc2061b1d67b1990df9fa9de7de
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, indicative of phishing or malware distribution. The 'SE_REMOTE_SUPPORT_LURE' heuristic suggests the document instructs the user to install remote support tools, a common pretext for malware deployment. While no scripts were directly extracted, the PDF structure and URL patterns strongly suggest it's designed to trick users into downloading and executing further malicious content, likely a trojan or downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://dok-vo.ru/userfiles/file/rowiredefi.pdf In PDF document text
    • https://gregor-biffiger.ch/userfiles/file/dibifilaxoxoxul.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898c93f1292---bofixod.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074653939fa2---69344983490.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/301d2218f381fa35989a26533e18249f/97308028115.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/54766100297.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c77cec9e---48944066271.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/155b588428c09ffd4780528a71f8af81/xinudimenupofaxekadu.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/67531701499.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/kowasonabamab.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a20b4d54---mafifope.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/e2ujjq7qbbcra2flpte4km0p6r/44711107276.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/rigix.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/95550348778.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2bd5a68c---mazopuvulis.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/csk9j7v2snrftajvknes3ev9k0/4110653245.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/355286051.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf5f1b1d4e---72739672572.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/92458496581.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cfb38261316c1e8a5bd17ebfafe09044/45298603177.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6363e6feef6e83f24bfc6db6cb593519/lezemexadogipotizaf.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/topagitumemigosemojit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=addition+and+subtraction+of+matricesPDF 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
font_00_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 17672 bytes
SHA-256: ee7d8bca448874f791ff8f5af6a96802c9ee03a39d53b924420d71d8e6e835ee
font_02_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 16440 bytes
SHA-256: 810f58653050c036fae0cc579cc19fd6b3731f5af728eef0955e22bc8ef8659e
font_03_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 10812 bytes
SHA-256: eb045f937c6b1c09301f74a21e6374f845aad99b186e9cb214e969c7119f2070

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