Malicious PDF — malware analysis report

Static analysis result for SHA-256 233f80afdf571361…

MALICIOUS

PDF

91.5 KB Created: 2021-07-15 11:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7a7b88ec1ff48656f443f1dd195f4c06 SHA-1: 011a287993706706f6bd1deaedf61d7844ddad93 SHA-256: 233f80afdf5713614a621b7a1f0f8c93bb68cd78bd9b3fbfedb388bc97af3ac8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://philabc.ru/uplcv?utm_term=how+to+help+an+overwhelmed+friend PDF link annotation
    • https://zzhqhi.com/d/files/bozitutikadevalo.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/2044946501.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/10535907877.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825c47c0ddf---kivajogemedikosapavaw.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/3f1f28a4c5da3699923b571082681239/19630168381.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/62020412083.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ca20b216003737ed3b6eefebc2953730/64627576104.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14c610a2a---mukekutobepuged.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea0383710---xubifu.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1560022d---wunegezoxomo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ab2afde0---51730517563.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6dff59dec---21539784516.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa67a0e2d---47894231939.pdfIn PDF document text
    • http://renovator.cz/files/file/82202855083.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ltmnrmd6vuki9oh9lvonkgrhf2/tibofaxinewanebakuzito.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/h5604so8vrdsufduu8jltpf9qe/49514670245.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c1e11ae2d18ca335e036ee21e11f8c40/51549628474.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070f59aea503---tomewemoropisanowosifumo.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fibeferodobij.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/71394139525.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xojepojupi.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/85857714014.pdfIn PDF document text
    • http://sfhelp.org/cx/apps/overwhelmed.htmIn 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_off000102fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 10740 bytes
SHA-256: c22eede33e5df2643ef24d94d0dc8194c621919c6355a03de08666abfb2a1cef
font_02_sfnt_off00013382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13382 16908 bytes
SHA-256: 47e7f3d1efe12a5b2cacdf6ffd38e47217e7e807dbcf25823a3a5635eebb16aa

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