Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6abfb1e42627f51…

MALICIOUS

PDF

87.1 KB Created: 2021-08-02 18:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e9d5e47d63c032e030d71bfa6bf011b8 SHA-1: 88b828270456e1437dfe13ce4104b412990b44fb SHA-256: d6abfb1e42627f51c1525b78a54bc1e4f49ae21e468114870da7f95860549a34
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to lead users to malicious sites. The presence of numerous external links and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/06aea3239452ad8e3cc21b05b8c4c087/fuzomu.pdf In PDF document text
    • https://area5srl.itfile/dugadixojofexuwadajed.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/gejunitogobujipi.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/kesobufosazatena.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/39978128955.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/83285882357.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/47763724054.pdfIn PDF document text
    • http://land89.com/ckupload/files/40291267204.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/dce109463fd032150b3fc7076d2bbe9e/vogokabotajafofafuza.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021073106515356.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075803807198---63484882000.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943f16d30ff---tawiminexavawiwavuzekado.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca705d7ed6---77395443987.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/vqgldkgl7r2134u7n2oerkevu1/2065154478.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/muxaguz.pdfIn PDF document text
    • http://unseretochter.ch/images/file/63850241914.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9aa7ba9f5---belukevukajidevozonal.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193a10f0c2---52592996153.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/tjuh7s29uj7nce5dnpaob0a3l3/zitem.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/repisexegew.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/5ql7ei1j18aok6eu4mq7nrs5or/41976254378.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/putedesivorefatefaro.pdfIn PDF document text
    • http://baudoinfamily.com/clients/f/fc/fc66627f90e8a365851b026dcf169025/File/58040454703.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/44481018687.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/36063903438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ecosystems+and+biomes+worksheets+pdfPDF 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_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 11252 bytes
SHA-256: a9ce0db6586ec7241deb90af09884cbb2b5420488495c7d11a64bc407e1175c3
font_01_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 17416 bytes
SHA-256: cfacf3aa98ccb93b6dc59638a383f98c5dd834204175bd1725a42328d4e2d11a