Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d233097c14e11fc…

MALICIOUS

PDF

81.4 KB Created: 2021-08-13 16:36:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 58c587f19dbc6cc4929bac9e632e17ba SHA-1: 64add13a9bfcd81ab4056e797fdcfa57b049e426 SHA-256: 3d233097c14e11fc39295d86d2fe2cdeffe377ebe54308d350551324479db35e
104 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to websites hosted on compromised CMS platforms or using disposable domains, suggesting a link farm for SEO manipulation or to distribute further malware. The ML classifier strongly indicated maliciousness, and the presence of external URIs and link farm heuristics supports this. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=cube+block+puzzle+schl%C3%BCssel PDF link annotation
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af912407cba---28093877822.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/libuxefosikegefebo.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/82998696235.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608f51ff63eb0---tigudogejofo.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ae097fe60716fb64ba561c5e2133248d/zalakavokegosolakaguvagap.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/xibufitisin.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/fisotazupa.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac00c02ced---fifepitebubifit.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/gawerujudilolavutudu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef8be0028---tobala.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b03a4c78428322f20558337e9a9c2c3d/28064307454.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bdcd1c29d70a3192e69c6421179320ad/56956393604.pdfIn PDF document text
    • http://congtyvima.com/images/Download/70893901235.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/70h115csh6i9ncfgvke8e3673e/jusedokulokopazigojaw.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/dbc743a3793585851f43bdadfbc38acf/gevoxefekuxedogepede.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/zelanaworokiruker.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gigudivapazogave.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovsi64hr2cob1bjn9ha26hr9t2/naninaxobibegibapas.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/1327963097.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/tidewije.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 1684 bytes
SHA-256: 72bda604c77ca771a1a14ee35dc8ff354b9f00ec81e947fe844e91f3a29209ee
font_01_sfnt_off0000d9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F4 16460 bytes
SHA-256: 99f9f05dc6648127e80b0268508dd6dd8cce2e1a5bf89c9c42bcd97774216e92
font_02_sfnt_off00010490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10490 10528 bytes
SHA-256: 8e35b70e6c0160ae17f75e4082c27ee276487e226643c89b62b2cb1a5428b6d1
font_03_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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