Malicious PDF — malware analysis report

Static analysis result for SHA-256 03671a895a158de7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-10 12:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4c919ed88c5ef9b858c05a339167ea0e SHA-1: 14f23f4629bc41fbc45ed22c9cb46294bbffdc40 SHA-256: 03671a895a158de73bac4d15ae2bbf70daf53fe15eec2c347ec3a3a84552d852
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. Heuristics indicate it functions as a link farm, pointing to multiple potentially compromised WordPress upload directories and disposable hosting sites. The embedded JavaScript likely facilitates the redirection or exploitation, aiming to lead the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://bright-inter.com/file_media/file_image/file/mujumesibixed.pdf In PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/kadowenu.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/6869082999.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/76325735404.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/nodifunubomuvixi.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/nikasibakiperi.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/tovazimepobikiw.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/nonuzulem.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/nerasexemogu.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/79574626944.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/96407386512.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d0883766b502fdf98bb030ffab1577a2/61355794944.pdfIn PDF document text
    • https://carlojans.com/cms/file/dolewumotetimugu.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/medigobogamid.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/renenukebat.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210904/file/25280235030.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/jogegimupijat.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/kiduzekipidixopud.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/gulenefu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b636725dd8fa5479dafaddc96a0ee626/tabenikipatekemunokowape.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/75222421234.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328ab2b10a9---72733680324.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090418080027.pdfIn PDF document text
    • http://adice-area.com/pictures/files/69114107098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=android+sdk+8+downloadPDF 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_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10380 bytes
SHA-256: 3ff6d9fddca0c7a457165394820f5546b41d7446b2eb04c015670e88042a5dbe
font_02_sfnt_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16848 bytes
SHA-256: 70adb7fdf03eef5b4b43030358677c200d3e9e6d7c8c0fae9a225ebf1f63638d

Open this report in the interactive analyzer, or submit your own file for analysis.