Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ce12822797a3362…

MALICIOUS

PDF

144.6 KB Created: 2021-08-10 17:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e26d21cd67361261edda2953e51c35aa SHA-1: dccf778092bb3e4185f16e18a3e48f105b3bfeb3 SHA-256: 3ce12822797a3362240964184350eff2553410e230e15dd3e9fb18c2384ddc97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The file's structure and the presence of external URIs indicate it is likely used as a lure to download further malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crysiq.ru/uplcv?utm_term=calvin+and+hobbes+comic+strips+online PDF link annotation
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29aae020f3e6648473b32e312e20b92/89555152684.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d6a228cab4eeaf19bad9e4a56610bec8/55567529770.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/10870808838.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb1157705a---60358135524.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160924125ddf48---fusisoxexewuregu.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a32f040f42de51f5edd22aacea73d26b/zakumosulagokejivazedu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/zafikidar.pdfIn PDF document text
    • http://citranco.com/users/files/27341884195.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9f819d5854afc7ffa2fd413a33bcf427/86157820743.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608154e562aef---3105285562.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e0d72f7a8d04f7bc09299eaf140a6255/wukagoz.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/0f3e32ec1b6c77f45148cf656d622db4/84746180331.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/ff942e10dafff766aea189f145e3f592/13218970504.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/gejujibenodexugigof.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d83543b71---9337369270.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/gixovovofam.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607272db4414f---vafar.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16100ade323864---20922779982.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/8600754397.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be763ac1b0---jogonosesuxipo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/balidenenu.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/wixonufinugudix.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/kesekezojiwabifabelixunu.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_off0001d33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D33B 18688 bytes
SHA-256: 4d01f771dcdab59a9be2f8bfcf54d6833a2dda3403935a4ecc65a7303dd23104
font_01_sfnt_off0002035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2035B 11016 bytes
SHA-256: 39075993c92338117518485fc15c68db3171e3b9b8bedfd161ad6762f10047e6
font_02_sfnt_off00021c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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