Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa8b8beff060e57…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 00:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4e8b717c097d7d9839ab837a055e9924 SHA-1: 6c3614ff0b3b00aae06f16c613945dcd55290955 SHA-256: 0fa8b8beff060e5720b13076760727c934b8a7fc06d8e31adec782356bee5e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or appear to be disposable. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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 https://geneolock.com/locktactyuma/userfiles/file/rulowisinetape.pdf In PDF document text
    • http://splogservice.ru/content/file/nusolebefijoxedorasi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7d658abed---8296669732.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/mepapomuwi.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/36822637337.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021043005190273499.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/fosub.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8bb3fe5765c9a35993a027b2f93e32d2/4927655638.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d3886d1a2c28cff708fbce5f48bd8f32/11911000355.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/totelosa.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/95788386716.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/57408799818.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/jurilabe.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/mitenozirexuti.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/e0a37lv1lqjmejg2pll0ab2qu2/jepasagobexasem.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/25193074271.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/af04c9af0b5838a6d7de0ce5be176175/69928315560.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c8e37237fede876b85f3c24e3e136ad7/dugiwesugasobosuzijekuz.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/fajixizejirol.pdfIn PDF document text
    • https://eniedu.com/data/file/20210801202150.pdfIn PDF document text
    • https://ebooksweb.net/files/file/23968027751.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ddc2d1958---gizivudafi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160748e2675f80---15989816468.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/64658784052.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16092b8f481e70---japoxobudefamebixobuvom.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/56780297258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=atom+markdown+to+pdf+%E3%82%A8%E3%83%A9%E3%83%BCPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 1816 bytes
SHA-256: c0fc7736146ba0fa39904bf62d2d0f118f4c3487aad28463f98739c55c98afcc
font_02_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 20804 bytes
SHA-256: 9ba6a7b00db8b295150b4b4db6b688a28600d9ea51317147968df8a88593e959
font_03_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 10380 bytes
SHA-256: a09a99674143343d773cae6146ab10777022c172b960fafd83687bbab2647abc

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