Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5230408ccd10a8…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 23:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9d1f34e2eaa463aa8d0df4aca7a93ac2 SHA-1: 9a2cbdc0236e054f4d8c170f459612c27a8ece11 SHA-256: 0c5230408ccd10a836530d3ec85b4148244f663ee8a1462d63e06b99b7b3e8a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a non-clustered link farm, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://archism.ru/uplcv?utm_term=db+window+cleaning PDF link annotation
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a93cbf5814d---39729897520.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/dejuxu.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/76b05f4f1eebf336b7d823121c195dc5/xelexesavomupur.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6c953efd---milemelifavilogepoxufef.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1587eaf2d38efdd0caadcad326817250/23886036327.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/06724bba068b8d41c6bd1347939ac743/dofoxisi.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/6939514588.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc22d62618---nozevosatojeput.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076c023c5d71---14948603661.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd46ec81b---66515740750.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/sevuwovuvonukon.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1grkj4jqo59hs3vdaa9kupp5h3/kolisanafewetovizilujevix.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/63385209292.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/exijerolov.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/fixoseguralamimariveri.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///poxuwisebunedefa.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c28b66e5db6---gimofafewosamamafebiva.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/1276391546.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/na3hss9n7lngtikbvqar4ii002/60259670395.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106051025452730.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/11021060055.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5be3bc3d1cd52760e7eea988016ce292/gegoz.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adff6559511---gogopowurepaworuvoweso.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dulebawumiwefiserix.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a2gco70mgu2ll7ara03jmu3n11/besesoguforugoxepevufox.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/srs88rudi8iofm9vuvhf3klbe0/zusodovi.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bec4ee50756---71125899943.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF437 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10408 bytes
SHA-256: 8d2381087866562f068b4e8af1930b5787bf0c5c4968a1f526b561f1b5dc5542
font_02_sfnt_off000123c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C1 17116 bytes
SHA-256: d376ec8968ddfd05a8a1287d888b3991483f236a01c2a7e7205198b0018f4750

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