Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68ee9ebf75d494c…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 17:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c41866f6ef676ac633f535cd1b3f80a SHA-1: f9640dd5e8d1eaa64d1b5bf579a5498121e58b8c SHA-256: f68ee9ebf75d494c2dc245b6203c1afce258860f72dd61ae842e95d3ce58babc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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=mathswatch+straight+line+graphs+answers PDF link annotation
    • http://chnli.tw/CKEdit/upload/files/96825381887.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/43064825118.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/kimapimorofibukut.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5cfc92eb---14221743347.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a09a25b2ae4---luvufisinixurubaseriwev.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/88459613649.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/76704842988.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/86603062184.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/luviwikus.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/74768372141.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/8iupioilpsjq5ah8e77p64mpme/tufule.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210730110936.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f9b7e090748682b0f2f0b3f34a107a20/zewuwuxenavaritido.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe832c3d97---67213148214.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/vaselujilavibutozenupit.pdfIn PDF document text
    • http://artospace.com/pics/file/59815567758.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4215179181---kipunan.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1c8f12e9a8e441b2d75cc8fde331f959/28662675260.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/88170779348.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/45088273547.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/305ee4f869d42f7f5dbd62337ebbad6e/57269127472.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/62288805264.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/93bq0c9ijnoar57v4t7896ogd2/46921668777.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_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 17088 bytes
SHA-256: 11be496f12cb66e878fbdb8c30f2a5dd5668f71a9655a035742d458a027148aa
font_01_sfnt_off0000f2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 10612 bytes
SHA-256: b956f97ef597bc5cd5a1c07019e0b8fb71c95fc8ece9ae9bc8c03820fcbeeef5

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