Malicious PDF — malware analysis report

Static analysis result for SHA-256 265054ebd8448835…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 01:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46d303ab42c2d94a96e4275eba82d41e SHA-1: 4de57b50b16ca947e0ee3139eec84d67a99f7a6c SHA-256: 265054ebd8448835b3c69326d7c9038b45dc53b091dc041e76bd70612c1185ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload from the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=download+game+rush+rally+3 PDF link annotation
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/36652536459.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/nakagawomev.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/fozadurokegeteses.pdfIn PDF document text
    • https://paperland.bg/uploads/file/58447868116.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/54930748262.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/tetono.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/semodozufejejej.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4f3e58ff2---tukezo.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/9672013505.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/zijogomopefidebuvet.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/xararilebugeta.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/5483907319.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/31386499171.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/75477829909.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/45507396863.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf0d8e7b4---newugapujufeva.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5572f79e9e245022730d57c0c5515ea4/votedibufopu.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/10061655452.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379d1713f51---mulopixazinevagog.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/zesaxuguforefop.pdfIn PDF document text
    • http://ttc-investco.com/img/files/ziladavanarelubemegoko.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/99090330822.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tenixem.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2af4d0e9---13946124158.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_off0000cb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB76 17100 bytes
SHA-256: 2ec9ca410eb5ce46014ff8f0c495f2d7ffffb5a497d609c57ec0b5ee35e49f57
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10980 bytes
SHA-256: 0e92335505a4ea03044fdd9e277a5ecc43ff0967759aef799c037ff671a23ad5
font_02_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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