Malicious PDF — malware analysis report

Static analysis result for SHA-256 d98e6c6b6bf7d914…

MALICIOUS

PDF

69.4 KB Created: 2021-10-03 07:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fce764308a630c350c9ead881d91cd69 SHA-1: 73f47c955a9616cc4152bcf1d05f9e3d955ac26e SHA-256: d98e6c6b6bf7d914bd4a30fc2f29666c0d00b0f069a48481e5744f4c22b023e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on different hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://sicilyontable.it/userfiles/files/keximisiwinuposawedatek.pdf
    • http://midesignvn.com/uploads/files/xipoz.pdf
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/79029637895.pdf
    • http://chinamakina.com/userfiles/file/pelupiwubegozekosekox.pdf
    • http://shyjjc.com/v15/Upload/file/20211021823424841.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161474b303fd5d---pogedoxoribeledixajuze.pdf
    • https://liur-krd.ru/userfiles/file/xapawuzemixunodilili.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/58094340868.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16157004bc83e7---62769786270.pdf
    • https://menlopark.com/wysiwygfiles/file/vepovalaxaxozizelututoso.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/214947006ff97310c13848a19ed60978/93600134616.pdf
    • http://dekogard.net/deko/veri/_files/80170246825.pdf
    • https://hattoco.vn/images/ckeditor/files/30571810181.pdf
    • http://chretkinia.pl/userfiles/file/86694195298.pdf
    • https://wupaojichangjia.com/d/files/23413089833.pdf
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/19730054170.pdf
    • http://fiorenzuolatrack.it/userfiles/files/36306208044.pdf
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/wexibebiwedijojabojawebis.pdf
    • http://saigonradio.com/userfiles/file/40896852000.pdf
    • http://zopos.zohukum.com/ckfinder/userfiles/files/neledipilubijegolulason.pdf
    • https://ijpdua.com/contents/files/gejamananidap.pdf
    • http://nbc.com.vn/ckfinder/userfiles/files/pubukuwazofamufarixanejo.pdf
    • https://moveo-sport.pl/userfiles/file/tulip.pdf
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/65882407826.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=improving+air+quality
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afe8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE8 16792 bytes
font_01_sfnt_off0000c7fa.bin
95f85336c45c83f0514da29cb5df364060e0725acf4154d0fb0e047144d37c87
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 15872 bytes
font_02_sfnt_off0000f033.bin
dc565cb6aff2517f9edd1a64231e56b93d209f436dd6c0c1082ef939b2fafea9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF033 10672 bytes