Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8221aa286151173…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 09:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a4182f72778eb3ac8a37a55bc7757951 SHA-1: 6959b40b36ebe0018a4049eb996beb9f44662a2f SHA-256: d8221aa28615117370a6ff16e37d340ed3fd9ccf1ddde268b3f5673a02b8c1ca
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external URIs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of a link farm on disposable hosting and the ML classifier's high confidence score suggest malicious intent. The embedded JavaScript likely facilitates the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4475b7cb2f3b8cece9def2f1c8f6d74c/49172203563.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a86a91e59208f22767ce623d9d266d70/81669249533.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/99413332918.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/wazulujerozewuvaz.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/88b4cb40a51b29744e3ae679ac216d30/57206417243.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8eaea94210bff38b04a26fa55d049a70/35364501306.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db5e999d2---dasaxepezidawotalerikuwux.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/io13j9udnd5hno2lr37033u5au/gelujezapofagipisi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/legaxagitabalezexifavuwed.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/mufirololabumaruxemano.pdfIn PDF document text
    • http://wenxuezj.com/images/File/32191188609.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/55166584177.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/mimomevoxivazafow.pdfIn PDF document text
    • http://asid.rw/userfiles/file/90183232994.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/0a5af5f087468cd269603123d2ce8885/63394820519.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fb7ac152b60f115543a3a954a53ce4bf/29113794944.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e57552249---15083551522.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c124abf196d---91950421434.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf373a695---repex.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/papogimadozexikafixamol.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6b5cb8a275892e44687c35118c9abede/67910809211.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ae648c35724---85066042888.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/mexabuwi.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/25082116370.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c435b1000b6---88494920359.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f2ce9ae9---22280377324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=group+4+exam+syllabus+pdf+downloadPDF 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_off0000df84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF84 11128 bytes
SHA-256: 9d7e0ff086cdc75a5d13002723d9f85d6e93f95eed1137bdb962e201c91a38c5
font_01_sfnt_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 21392 bytes
SHA-256: 6932d50e969795ca7c1cc35c275191d713dfae3147143fbfa239c89d537024dd

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