Malicious PDF — malware analysis report

Static analysis result for SHA-256 2debf25b7d7e635a…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 05:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9212e4be78b935657dae731481b0855a SHA-1: 0daa59ce5a4d314facea01a625b3b6f22e9e4543 SHA-256: 2debf25b7d7e635ab32c2ca16319f4bd85a4c45be3dbf92048457c71770ffb19
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://huntic.ru/uplcv?utm_term=in+grace+meaning
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2rbia1hm2a4124upo6vbcqck95/tidet.pdf
    • http://spy-military-labs.com/userfiles/file/pidaguzexofepagapazodegat.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2c8cbd2fd---womamate.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095450959c3c---nozavunolurazano.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd445dc8418---nufofilobugunazibekafegiz.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608704fd40371---3206807902.pdf
    • http://stroisvias.ru/userfiles/file/pavegijowimipugo.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e465517cb3---13999625252.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf109522cc---majizegugalifulopibo.pdf
    • http://harchovyk.com/userfiles/file/dazarelodizejafotozamo.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/485dbe161f2aaa41eabf17847d0e886b/dikukusudexokalavub.pdf
    • https://mamap.in/ci/userfiles/files/forenogasigexujud.pdf
    • http://engroupe.ca/aym_image/files/46730123101.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af5d0db07e---depesezaj.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dab8f95c1fabe99d85c8cc077350f740/furegazewunekawelub.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ce34c29b7---69646851673.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d28c37d0db72c44f133b48cca1d1890b/sozoxagevaresejenepam.pdf
    • https://galerie-louise.be/userfiles/files/96959498260.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/0fe9389668cbdaf0dacb3bfaea18ab8b/ritelatezuj.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d5133adc5ab05d2ef8540a7fc04dfd14/61015383469.pdf
    • http://xmst.com.vn/app/webroot/uploads/files/zufezopaxerosorepafif.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb65cc19e79---66975219914.pdf
    • http://azizolace.cz/images/file/sitovununa.pdf
    • http://lafayetteconnections.com/clients/52818/File/lemolukejase.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA09 16792 bytes
font_01_sfnt_off0001121b.bin
d2cf5352c42bef9ef0f2c1118487bc53c5fdc7ea89a6b3c88cbd0814f9ae14a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 19028 bytes
font_02_sfnt_off0001425b.bin
4a1e3b9927a4127d667af0e09e9530e07ffe3e797b15a13cf011eefc3b4ce145		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 10092 bytes

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