Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a7e6fcc93349ff0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 23:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32bdbf5dc2534f11d22be6bd796ebea3 SHA-1: 3233306337c3ec260c3024f79e8422beb7c02210 SHA-256: 8a7e6fcc93349ff0cae70ebeaf6b0ef94aa729e2456f07e8b32ed5a37c6aeeef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=how+to+install+android+7+on+any+phone PDF link annotation
    • http://oilmachineydy.com/d/files/velawevaw.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/jixatizogikebekorir.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae0fc0c9be---tupafebifufawuxiveb.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/pigiweze.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed0882831---fepazu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7a48293b866e0ad6650642df36005bc6/zutevexewaxupe.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/73692142634.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/xiwadudiraxixo.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109131504304798.pdfIn PDF document text
    • http://www.agot.pl/upload/file/63496923190.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/letejiwanomanevajuro.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/xojafosawekufefa.pdfIn PDF document text
    • http://effekt-film.de/files/file/97209174066.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/85475289262.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a3000a7ba5fe4c5fc785c85b5c26e59a/noxitopofifemozetefiziluv.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/73385738494.pdfIn PDF document text
    • https://anaksemut.com/contents/files/jizor.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/laniliwi.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nusapagopa.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/51720192659.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146801ceceaa---tuvepisodebuf.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/94200015872.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161419cfe05215---xiwexogexo.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/kegusilowijebixomo.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_off0000e708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE708 17620 bytes
SHA-256: 585e3bc6d9a1f29ef956f9d45ae38767ada59527b16d7d5288ebca1ba39721a7
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 10732 bytes
SHA-256: 2cd2221f422cfdda37e3757c238afbc6ceb64ac54b9c9613ed37ab2a1148d969
font_02_sfnt_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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