Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24c44d3ada7d6f3…

MALICIOUS

PDF

68.3 KB Created: 2021-09-25 08:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9dfab7ca91cc21cc976101a7357c77ad SHA-1: 7e370f194351b53ebca90638c98e8bf5f972fabd SHA-256: f24c44d3ada7d6f371a01d687087d13a9bae86329c0ee0be61bf6d90010807d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially directing users to phishing sites or malware. ClamAV detection and ML classification strongly suggest malicious intent. The document body is unreadable, but the presence of multiple compromised CMS upload links and disposable hosting URLs reinforces the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=no+sound+on+chrome+android PDF link annotation
    • https://aynispirit.nl/userfiles/file/dusejinuxisulo.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/25996468422.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/34797343498.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109010821154668.pdfIn PDF document text
    • https://aromamarketing.md/img/files/16396424951.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e56e87ae9b---xesixurasegarerik.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/negevajifebuxunuvokaxod.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/35783433135.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/rupowexevawedana.pdfIn PDF document text
    • http://otczenacts.com/media/files/mazibixokukinemasaloraj.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/22562551305.pdfIn PDF document text
    • http://tencanpowder.com/d/files/piromosafereguwaz.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/tewuroxuguletagotop.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/28130216774.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/70221306187.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a1f44b11a---woxotebabiverekukevajeju.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/legevawulovotamexojawewaf.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fbvooqr7vsb8ts3e5u4fr9ujsn/fuginutotapilakuduvi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e069cf071f---jexisipolanisujesexitolar.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/71972471929.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/naniti.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/52407538240.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/40917804772.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/56712887704.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_off0000af72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC784 14508 bytes
SHA-256: f6525a133d7c619a9cf107bf356a6de90e29d95b620d61fef4ca36d87496380d
font_02_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 10568 bytes
SHA-256: 71fc23e6b1d0f9e2bc07cc8717d45ce588ca218b5898e41942c4774b634d7618

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