Malicious PDF — malware analysis report

Static analysis result for SHA-256 163a1a390e35f3a8…

MALICIOUS

PDF

72.0 KB Created: 2021-08-25 22:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a27d990c7610d650d1719d50145b0689 SHA-1: 7411fed868d5d4639492ae728c358fbee8ff3101 SHA-256: 163a1a390e35f3a80a99b7021e995f599146ed888b67c87e220b2c4a83f2bcda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and embedded URLs point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160717e8ca9af8---lugepu.pdf In PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/lenukiro.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/xokagiporunul.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cfa6f3417---74124432883.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eaff9dd32---tosofewerosebof.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/nelaponagivokixus.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9ue9hcbi72tqi1eel9of0bkrl2/tadoduvolodovavixorefikez.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/7557726105.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210528200856.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/82683594702.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/41221135791.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/97162284320.pdfIn PDF document text
    • http://elai.kz/upload/2021/08files/210819135251491166kip4r.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874791f11fc---nofibafipuxuginomilizivav.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3428d81f64---zuxuwesexadedijodopale.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/28173695217.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/144dd37d0c028aa0866b04324cbce1bd/ruvinafulelozuj.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r21id48q6p1ir9h731ghehomjq/lefoluwawoluwixixibep.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/438481c79f374b18010e2364fd419392/59438240176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ba+first+year+education+notesPDF 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_off0000b53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53D 16572 bytes
SHA-256: 91846d34f91406cd1e4704089e991b45d7ba085dbf41ce9dc902b1a3f01dd10c
font_01_sfnt_off0000e034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 10692 bytes
SHA-256: 5ff9f0564668d42227dac751ca5b9c103494278a5de0f25c3e45e3624bee1f97

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