Malicious PDF — malware analysis report

Static analysis result for SHA-256 80da498edbfa5e73…

MALICIOUS

PDF

75.0 KB Created: 2021-09-23 23:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7d58f1ac52d881a669934c35c6342ae SHA-1: 4b683140bc576d66ed2c290765da1901f6a0fea5 SHA-256: 80da498edbfa5e7312a7813bae95fffc44215c50c0d59664f2262c8432ba977d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are structured as link farms. One prominent URL, 'https://oniceh.ru/uplcv?utm_term=download+winning+eleven+2019+android', suggests a lure related to downloading a game. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns designed to deliver malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=download+winning+eleven+2019+android PDF link annotation
    • http://jacsonsfurniture.com/userfiles/file/zuniw.pdfIn PDF document text
    • https://wasael.com/userfiles/file/73405063208.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/ribupanipo.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/wevixasetezapedav.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/8056700080.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/95369707573.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zurorowesebamakezog.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/wisotupitiselujewi.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/jozezixipujigekipozukaz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613618d4ead74---72590411592.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b324849293a810b76fae6d2e234a2b85/84948884951.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/29784842815.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/lajifasife.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/farejoro.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/62301286604.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161364e6540f9a---90726413377.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/5061432073.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/rovevogekanuvudemixuxezeg.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/29833779094.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109031142445824.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/fesozesufuzut.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8f8c37dc8ccb680cfa1968f6eb278dd9/rebezepodekoboj.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/78033185443.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/webisiniwuwigogelom.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/nigusixixekodipizuganex.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_off0000b936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB936 10772 bytes
SHA-256: 71966368c91c8794b419dbd1562a58c480c3c438c8562782df4da902a7bd78d3
font_01_sfnt_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 20224 bytes
SHA-256: d5f049aff3093df7d9c502a888b1bf64680aee7d4af64096255089092e72f363
font_02_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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