Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26946e5419364a5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 21:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f090b2e1b7a5aa6328604354c77149ca SHA-1: 5779ee1f5ab15fb0017b9305d854b4e5f649cf67 SHA-256: c26946e5419364a50b8d4acbd99a06e441fc5435d9a96c47e7d027a066a4c6f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://medvor.ru/uplcv?utm_term=justice+league+four+hours PDF link annotation
    • https://delta-relay.be/userfiles/file/87168616067.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/66469824404.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f0b1356c0e6ee5bc36048ff7edea0002/4799569818.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/remaveromoxenowuxutizili.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/48541483148.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/mivuxeneliribajamulewu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6133dd57d---34504277546.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/38120302329.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/90355797587.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/kilokigisubejaza.pdfIn PDF document text
    • http://4darchitecture.org/img/all/10860451420.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326eedc1cda---20868629032.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/sogat.pdfIn PDF document text
    • http://cutskytools.com/d/files/ramuvakupe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6af91ff732bcd8f824b5c82a54ee7fef/ruvisinuzeginofiwozud.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd882da449---51428098686.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139502b9ff9e---besix.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/bafezobikokof.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/99263108724.pdfIn PDF document text
    • http://net-work.cz/data/file/xupolumalirikesefari.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/5641949664.pdfIn PDF document text
    • http://hkalc.com/userfiles/pezudefa.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/99747acdc56f496a69377e3d71d399ce/boxupevesojumaduk.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fawigulovo.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_off0000de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 18424 bytes
SHA-256: 2da6af638b030a3766832e8f74ed4d333360bcb0fcb2bce11e5118e9c1002b60
font_01_sfnt_off00010e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6A 10604 bytes
SHA-256: 137f863e38edb11cfd080b7f241efa9f7b68af529566403fe11ea25256595cb8
font_02_sfnt_off000126dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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