Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69a27ba24893174…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 22:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f9f3c8442fda470c96c4b59ade765f6 SHA-1: 28f7badec81cb8eef22a57e6d69ac3fe925cd10f SHA-256: a69a27ba24893174c6ec63dd6f6f8f3cd2d4218923da7b6222b58b1a9307903b
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://krisoc.ru/uplcv?utm_term=hello+kitty+pink+wallpaper+android PDF link annotation
    • https://vcubusinesssolutions.com/userfiles/file/88445944260.pdfIn PDF document text
    • http://vce34.ru/attachments/file/18748451663.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/56d03361d085b53cd97d194345bd7f4f/tivikaji.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161418c9c29cb7---29956083875.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/45739370582.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zunowake.pdfIn PDF document text
    • https://dukupahit.com/contents/files/2552521909.pdfIn PDF document text
    • http://chieucoingason.vn/files/19197308168.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zekamabidotavukokowu.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/bexisadutonowonali.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jisomibusupulorimapeb.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-17/20210917205314716563.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4a63d5818850957b754bbd05bbfcaed7/xufogivijegod.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/42451808724.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/51444732619.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/21309061913.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/dominedaredibodagise.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/97988087301.pdfIn PDF document text
    • http://dnepropress.net/files/file/65018056941.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/kifozixofo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac25e8bb1---64765162468.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/razubupiwuz.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/rozavizafejexome.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/81792128396.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_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 10500 bytes
SHA-256: a88d4b0e5ea0790a9f7e0372e98188c7544421fe6ef615ae7e21603818c772c5
font_01_sfnt_off0000ca97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA97 14880 bytes
SHA-256: 305a54b42b800a4265434bc3186919fd913084289f15a085f3b4390d0b92de70
font_02_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1