Malicious PDF — malware analysis report

Static analysis result for SHA-256 9623d859b0e68219…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 02:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6619ea9743b7e32280e7f9fc4f94e14 SHA-1: 5d2c02b9e2bc8830ee200384273b2290a162307d SHA-256: 9623d859b0e6821932fec12733a9fe2368a77ea4419c7c485dbabcd234c41aef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or conduct phishing attacks. The ClamAV detection and ML classifier further confirm the malicious nature of the file, suggesting it is a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=turbo+vpn+full+crack PDF link annotation
    • http://didula.ru/img/file/94326039629.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/55479823118.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/pajetimagipurojobezeliv.pdfIn PDF document text
    • http://strandedtattoo.com/file/29634027862.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210910063435.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/77931165365.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f34496702e---xawiragike.pdfIn PDF document text
    • https://phukienbep.net/media/files/43838497306.pdfIn PDF document text
    • http://markone-tools.com/upload/files/48807215301.pdfIn PDF document text
    • http://apart1day.ru/file/99567847068.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/7a87eacbebd0cb2ab2fdb8fca9358b22/9166572221.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/51526608106.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/nefozasapesajuxi.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/81622887661.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16135aaafd6d72---76113792812.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/kelafad.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613914a790198---palimilapodiribepuxup.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/7418216957.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/pofusegemebimenus.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/dololoxamaseloweberiboxi.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/mezidofusi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613661ea8f3a1---jivogubimujopo.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/lagavu.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/kumapepuwixatawutogova.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_off0000c4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E2 17736 bytes
SHA-256: d84288b5a15c6876625c4d3390d3ca463df9c9218d30d5ac7dd2a5b04e12a94f
font_01_sfnt_off0000f2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 10344 bytes
SHA-256: 7da7e7f204d83292e86e06913f3201304123f9faecc303b7e9e500655a63d3f6

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