Malicious PDF — malware analysis report

Static analysis result for SHA-256 0670763293cded9a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-10 19:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d56cb21dad7f225127dfb4b3dcfedd3 SHA-1: 0c6455eeb695deade5a5a07df04c434f847dd455 SHA-256: 0670763293cded9a46b6338a219bad6ea6b9355436581559f180e4446a507179
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://sanruouvang.net/images/uploaded/file/feduwivibuwokadigagexazuv.pdf In PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/sitisomopapitu.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/pulodozili.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/1644968966.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/vibedaroxo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c9b1e7bea4c8ac0786768ea19bc04f10/57421025432.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/sakeweduxobodenedewufezu.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/91478592373.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/50660936658.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc88e82055---22051805734.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/rometiravobemubokodijip.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q4t936gk4b9crskbgcfgdr6uc0/gasobifezulomutup.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/bapumomizopiwamenenewul.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/nibilidadesulurafev.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/63587678883.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/94034685556.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/wowukoru.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/paxebopabab.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/sesofojowo.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/30270058601.pdfIn PDF document text
    • https://airshow-bg.com/file/lesajemudozugarimej.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/43641146025.pdfIn PDF document text
    • http://elskenecologie.nl/files/gufosolodura.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/jusawosofaki.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/bokufiligimof.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/jegaluvufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=silsila+full+movie+hd+1080p+watch+online+freePDF link annotation
    • 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_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 17716 bytes
SHA-256: f9a730404fe4fe5ec225c062726e13e1bf65ec0166497fa17fdaa3c7956d8432
font_01_sfnt_off0000f945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF945 11596 bytes
SHA-256: f1e3d18092e65a794b8b01307ae5a915c46325c93cba137f84b2f7a152559a66
font_02_sfnt_off000114aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1