Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4e233c2ced8338…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 19:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d9fc872ee5a5236ff0b79042fffb1ed SHA-1: 86b45e1e6bda805ad954886a6ef8a5074ff5abfd SHA-256: 5f4e233c2ced83383370052be79e817d4109884de1498a4d2edb777168ff16d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external URL redirection. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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=table+no+21+full+movie+online PDF link annotation
    • https://evrenmentese.com/upload/ckfinder/files/rorimazegixa.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/80283135581.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/58995228224.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/60150042141.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161347de64b491---mogugesolaluxala.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/77969188518.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/vixamukegelarajepelinevi.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/kexuvomuguxosob.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/11589695122.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/sosuvuguv.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/82523586314.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/niteratonukotig.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/gefewiminuvododirugem.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/64312876159.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/kojilimifegato.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/8370835418.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/jegugesuse.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/sakujipejo.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/jufodozovi.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/kenobabokupapumewi.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/2fe79ebfa77e92863879ec17174922f1/jumedotonixujusigosoxexe.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/74813312718.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/63670565192.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/66ae7c5058879a26ab24bb76e5c71366/11503967009.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/27712736530.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bapim.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/36466394202.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/29272d8653b1be11bd50aecc7167473e/94851555116.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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 17188 bytes
SHA-256: 55aa19cfce0580b7bac3b401315d6ab9f7be688e1929ffcb76b5ecdb369c20e5
font_02_sfnt_off0001218a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1218A 10452 bytes
SHA-256: 027af249fe40efe220cedffa9d12babc495fef48dc7d112c3508c82b61f049a8

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