Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28d158bdd8cbbaf…

MALICIOUS

PDF

134.8 KB Created: 2021-08-03 17:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e458b5bbcd93583263e8f99f9ae43c75 SHA-1: c96c351dddf465dd6aaeb179ce684c24535f3e1e SHA-256: e28d158bdd8cbbafa0fbfb659aac4d1548ecaecac481587ca4e8e46e87088e83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://philabc.ru/uplcv?utm_term=countdown+10+weeks+course+3+math+answers PDF link annotation
    • http://xn--om2b25zm6igqb.com/ckupload/files/12078139683.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/monovazitenenezelin.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/ko9jrr9qqs5vb78agh93m64b8v/46265695197.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160739bf89d4d9---vowafesaberigaxitulikumu.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/topagekutatogudorupo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160760d3189e9c---12529064731.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/tefasejupepinirudizexu.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/gajinowutijiroj.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/3571389890.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076786db0eb7---wakofuwupajofi.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b38d44c5c---54359510337.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608339072d39d---31469944616.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075bda514f3f---58110818685.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/gajegavimuximipipizilem.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/26374181505.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/19216920377.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f65895336---bivamoserowefafateroto.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/da823c516f1074e6803461a20d69d482/jeziwevobaxunasobiwozimut.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/76544990760.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607f857d155c7---wozelivuxelemirodase.pdfIn PDF document text
    • http://jarosi.hu/files/file/32488342388.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099a10573de4---49968356644.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160860f6d60738---mofeviporibunexizovuxedak.pdfIn PDF document text
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.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_off0001a5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5FC 19148 bytes
SHA-256: bf17767d99d50419e5bad52e0471f0f778430560b5db2aab6e9bb7ede0a48e3f
font_01_sfnt_off0001d8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8DF 11152 bytes
SHA-256: 5f825f042cb78a632077630f170ac3e2c7eca0e4c9a15ecd0ad480c1ae04fa03
font_02_sfnt_off0001f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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