Malicious PDF — malware analysis report

Static analysis result for SHA-256 e715724e5cc0efae…

MALICIOUS

PDF

86.1 KB Created: 2021-09-22 18:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 76e2fe2e7195fd700dfecb4870811d92 SHA-1: bde4b1dea65fd8958cdf6f500e7427c0122bf3ca SHA-256: e715724e5cc0efae04f6a6bbd2394dcf5cce4439af3211b34c012c8ba437ad29
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://immodraft.nrw/images/architekten_agentur_images_/file/87739481209.pdf In PDF document text
    • http://halanmilk.com/upload/files/fevakanefazimibu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/sabagipidewopelozo.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/37612055725.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/981addd4928cff7a901ab18e9473adc1/wotuvefurujozajevovuj.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/54755156021.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/voxajasemezug.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/45025065896.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/73433578061.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/57183507621.pdfIn PDF document text
    • http://termocity.by/pics/files/91673231760.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/sevilezilagesanewiweroxa.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/wosamobuv.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xudelozojot.pdfIn PDF document text
    • http://yuha.be/_files/file/84664090467.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rozanijapekomurolejod.pdfIn PDF document text
    • http://teknis.it/userfiles/files/xevutete.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/19506406765.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16138000b8085d---90287688243.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/2269039866.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/boxipabuxow.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edb4c2fa05---37673466808.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210907140441.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8697e75ac---75985298833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=video+codec+not+supported+on+androidPDF 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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 10528 bytes
SHA-256: b2f245a7064062f96636cf19dbeaaf257a0880e11f8347b18651bbbcc052efb8
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 19136 bytes
SHA-256: 4b83f41a7f5a1ad04bd87adc73b2f17db99c10589c24e49401685d4dc46dfb54