Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c1afb8d4ae44ee…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 14:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f32a69774d6af21722d037274091d7e SHA-1: ddac6b10e5a41d61c87dd7b533a3d7c604c50a85 SHA-256: 23c1afb8d4ae44ee644a42ea531794a32aa5ff3e8c9db3547c617daff7b2ae6d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also includes numerous external links, some pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates these redirects or downloads a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vejiwedem.pdf In PDF document text
    • http://bindashnews.com/userfiles/file/89637511577.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/68774344230.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/jozasubela.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/73915203295.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/vezonurulebodunabuzixev.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kojuvenoxiguwi.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wofanuzovewabamenugedal.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/puwibukawaxevizolamisoxuj.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b02fe984c---zomisaza.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/40576038792.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/40338446441.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c3af2789---monusanaradifagelulam.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5098a4a90---saremebapifa.pdfIn PDF document text
    • http://clingac.com/d/files/92288268908.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27eb10d92c8dd76f8b4a0cb2e57f1385/22188954379.pdfIn PDF document text
    • https://dukupahit.com/contents/files/vamogijodebonewij.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/revejinesugenokute.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f68bc4c0a---29172021438.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/2340924990.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/gejuna.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/kafigatutak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=1337x+torrent+proxyPDF 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_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 17524 bytes
SHA-256: 7b9312db8ad228dd3596527cf0a5887d4325915364aa9e952caf095071a373a4
font_01_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 10168 bytes
SHA-256: 429c271840d04162a534d736ea5f0a5b288d65065ddfdf8aaf9f523379b968df

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