Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26b9e13023743b4…

MALICIOUS

PDF

87.7 KB Created: 2021-09-09 01:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9cb85baf9ac921628c16c6292ba2d3f0 SHA-1: e44bbee404b17973a26ec62184d7074a69c66fc4 SHA-256: c26b9e13023743b47d0cb13a0895974a89c49e4b5bb4b0ccf1306cc3dd9b67c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the 'link farm' heuristics point towards a malicious document designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://cructi.ru/uplcv?utm_term=black+navy+war+2 PDF link annotation
    • http://netmutum.com/userfiles/file/lomubo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9387c83eade6ad27c00116df34492486/33954708520.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/29049431060.pdfIn PDF document text
    • http://inwestorfinanse.pl/userfiles/file/65106731826.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137376cadb19---gozusuzukijirufabi.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/gejorodisasuwatavutew.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6cab3cae8df46dba51228f16fa2638a9/dabogi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/be7694b133c8e055363e95efa424779a/6247949575.pdfIn PDF document text
    • http://sungder.com/upload/desemu.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/rukesezosubabusesozeseru.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/74cb68a200fb8d5afa1467929bbfa589/72267929103.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/xuzagepazupi.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/nufadukifene.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/96185881625.pdfIn PDF document text
    • http://metabolit.ru/files/file/59058051701.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/29981600522.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/7072680916.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/lokuxutodinuzelubadis.pdfIn PDF document text
    • http://isvpro.com/custom/files/34607450379.pdfIn PDF document text
    • http://rjt1.org/upload/files/93661951559.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/46079267540.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/jigiguwutexizapeke.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/tivifagebizame.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/nowadefiniginujupatufuko.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/81410003073.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_off0000f21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21F 10144 bytes
SHA-256: 961dfd872ce5643064b241b6ea21604ff2f165d4ab28efe33acb4264774a2d68
font_01_sfnt_off0001090e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 18908 bytes
SHA-256: 748d36be757eeda2591353c2851ff1ba787e76ff1c8f6d6f037877ff67ea56b6

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