Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b3c104457c0041…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: de80ceef62c220537b0ee75ca41f3013 SHA-1: f080cd2b6113962c6a734750c32f59fca72af9a7 SHA-256: f2b3c104457c00413c7caf7ae2776cbf5fb2348f02e92c894c7c133d7ddd55ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pistant.ru/uplcv?utm_term=guerre+de+cent+ans+r%C3%A9sum%C3%A9+pdf PDF link annotation
    • http://cokhiminhhien.com/media/ftp/file/gosepuzavedawovuxapumexe.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/razofap.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8d65d734---xawizixi.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080056d3d2dc---kujojirosegu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/d57bp0p7nfnfq6b3is67u8ovf7/domoloferodew.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/tikefizofegawibozotovuf.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/linefageroluj.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/13446233535.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/kezetilikewebus.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/dorenef.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/feberudizelororuwovusin.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vubikopefowomizivevuwut.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/18835257409.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a560642c7fc---14030998508.pdfIn PDF document text
    • https://landi-bg.com/images/file/44403290079.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/4f39f13f6f331f8443f5877264c48cbd/wilebinovuzejixixijisof.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/ba1c452c5263daaa579eb40ac36ec151/fevoweredenudevotapu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/34618575352.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/bunilip.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kizokavag.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082daa66eed5---filogowojogum.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/4b3660d098c70ebc33fdae22165826c1/sesibaketadafuvubopozi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2484d684d8f7aa67d9a3b26c49f8c3a6/8992074126.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8094c1e---junowuniworipoludatoru.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/d4430d8331687e5a8c05500c7c34bfc9/90794947752.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/11668584930.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_off0000d0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C2 10816 bytes
SHA-256: 3f4a017e9ae62522eb35e6dd29a26fd8a70bd2f26221a67317e8dd9d98432fac
font_01_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 18648 bytes
SHA-256: ba7fa0ea01ea56be8a24e06fa4026a3c011b9637d608de5664d683856ecd5b5e