Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ca877a0aa18363…

MALICIOUS

PDF

95.3 KB Created: 2021-09-17 22:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6fee10187a433ec5d53ec137d56df15 SHA-1: f8e3678c7d76165814f02026f4d1416c94c9fce0 SHA-256: 72ca877a0aa183637381ebdc619cfca4ef07f739d985f553c7583396c62adfc6
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 link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://archism.ru/uplcv?utm_term=nypd+blue+putlockers PDF link annotation
    • https://siangyun.com/upfiles/editor/files/63632276615.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210911030849.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/penivilakobazigefugaxu.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/15993679587.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/33043113009.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/25999003642.pdfIn PDF document text
    • https://afayl.com/userfiles/file/47551445307.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1b7b8553---fofoxifukexe.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/zojipoxamugelat.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130543a1c08c---48677516682.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/xunirezurewoviwezaweguke.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161408eb3cc032---17051067745.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/nodiz.pdfIn PDF document text
    • http://sbkf.org/files/files/jedalosukatorotorixon.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3cafab874bb0db7e57d43da17709028a/84792566262.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/64104029028.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/36093110254.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/21057750201.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/pulofupomabidumulesusu.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210901051727_c2VuaXJp.pdfIn PDF document text
    • https://areicon.com/images/file/zevelido.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c2384b38d---lerivotidonosafafa.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/fiduraledozowob.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d847c26f---jipizi.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/75787048712.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/88768735823.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_off00010290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10290 10572 bytes
SHA-256: d46a517c26692fa6f52f17a779d592a8117c2ab36eaa37aa291657225809744f
font_01_sfnt_off00011aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA4 22244 bytes
SHA-256: c686c5342bd0a9b766f4ab25d3457f1c7b63d6db6fda28a331ef34763bde763d
font_02_sfnt_off00015663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15663 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1