Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a953e2a14971253…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 03:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c109c05b629cb6bbbb166eec460a29d SHA-1: 065e252c46a8471e99b90ae22cd1b833a5d04313 SHA-256: 0a953e2a1497125385d5b6ea18704de3be3d9ff6e8d6e5c996e618fc497839a7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The file's structure and content suggest it is intended to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6b9362df2---niwotev.pdf In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-28/20210628053639730263.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/7ecb26472c3ca5baa68cd1fb64b45359/tedagisijelo.pdfIn PDF document text
    • https://www.gcnaura.in/images/uploads/files/mexepusekuval.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210708195733_675821011.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/72551095585.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/niwibi.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/fokusukimanusalosuk.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b56d66247b---87553906635.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fcf7d4b1f6e22f240d1d45e2623cdfe5/96825198034.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/24505284951.pdfIn PDF document text
    • http://sam-global.info/files/file/rotazunaparabome.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607170b37f314---49797718382.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/bf20c511d78319d5b5cbee4866e594cb/21214085342.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/winumedifatazimavelal.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912f7a6aec1---seporatewage.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/eeovgdlr1hmljjtmorl9qhc1u6/7172872710.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/suec0bnv6fvd74htbddc6u1cb3/buburawodafamixibin.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/6a44babf381755ab3051e28b30380484/84105174711.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bda152f6---18584717752.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/42ba975dbbd49fb72a02bad3a352b6eb/69930188780.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbbb859417---96302971033.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e85f14b---23237168357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=author%27s+purpose+worksheet+1st+gradePDF 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_off0000dd01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16928 bytes
SHA-256: ed966bbe163f9d0e7f0d819f85a4acedb05936a25130c045027bc3b78735e561
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 10776 bytes
SHA-256: 518d29feea9af625742f74cf748b418e1663db7b505f7b7b8b94c919cad653ac

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