Malicious PDF — malware analysis report

Static analysis result for SHA-256 880267dc1b4eebb8…

MALICIOUS

PDF

94.1 KB Created: 2021-07-08 14:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cb5de173b323e730832bc5becbf037e SHA-1: 71dc4687f9deb282b3a9289516bd30d433092923 SHA-256: 880267dc1b4eebb8d34c1297c9d5385142b66f7d8175c4bcbf253fe4fc8fa487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an effort to distribute traffic and potentially mask the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=philosophy+of+education+quotes PDF link annotation
    • https://faresaldabbous.com/uploads/files/21737508832.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79fa137b2---5353103120.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe936cadbf---89772672747.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fagulalazuji.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a6e464e9aa8dc15dd4c8305ad9b30475/feludemerojizeporame.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094788f484c0---53487961245.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/xipidakonesavejiba.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/gepubuvuxudakopefavewon.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e1a3c6f299ee141502e45c2df4bf66f8/zamukajijotimapumuwaz.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8c3a2a9c71663fa054cda7cd2322b0ec/57635092240.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///47771262467.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/42554633904.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609e72a4dea9b---54953429614.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a3509291653c1e4aa684e5fa36f50801/65158217760.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/mavatimutufevuloxofex.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/72b9729e1237ddb0026bf253367bcd49/mavusejusupoguxaja.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pf792cnm94t88cv9n24eb3g5l5/74781771843.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xejifarolosobewana.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e30166112001bea74937753db57348b0/fabajemadaki.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/34d7b43bb3d505a8a40407f6adc738dc/27171880818.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19358980d1---fosenigijafov.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/nojose.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb246e2838---fasinodog.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_off00010cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB4 17264 bytes
SHA-256: 70a4b9ae3564a92d07d0e7c4abe0cb64eff0adb13af03b4489ad28b3b8507ca2
font_01_sfnt_off00013983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13983 10976 bytes
SHA-256: 3dd7c2539cb464b4d4d9e96c694a4610e47b91cf276de0e29c79116a588252c8
font_02_sfnt_off000152c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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