Malicious PDF — malware analysis report

Static analysis result for SHA-256 c999813f0bd46856…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 05:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e14277ecade88e8e1d27b3b3f4ae4a27 SHA-1: 12fd251aaef50852ddd8bd7ca4c587e45a74d743 SHA-256: c999813f0bd468565501de7c1a1cf55a50b3e89ba0736feb4aa9ddfb5cce07dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that directs users to various compromised websites, disguised as a download for 'farming simulator 2018'. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, indicates malicious intent. Although no scripts were explicitly extracted, the structure suggests it's designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed6a324200499c4eebb9f9b484e1cc19/72288918196.pdf In PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/buxakekofakalujipasozedi.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/85552808573.pdfIn PDF document text
    • https://sealskinz.ru/files/file/fubetaw.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a396fb0d91---20909770972.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/36062550316.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134386f38ad4---94387178692.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/viruvijusirimela.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/tugoxirilatupudu.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/nubuzusa.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/9189311413.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f0e88c135---73904616569.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/80888698785.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/leporifapuguxupatifa.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/guwalexepibavawe.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/pumevokez.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/54585982527.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/xojafuwoxoror.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210909092541.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/5225014094.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/7400296546.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/zelofadevogudabedanaf.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/tifanazulirinutulesape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=farming+simulator+2018+download+apkPDF link annotation
    • 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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 16584 bytes
SHA-256: 314124639406f8cef30f9fe268016d1e19ae1d33b8b72b37c016ab6b8c6aa51b
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC2 11360 bytes
SHA-256: 17d564428fe13899b3d5214308ed69a60878d9a463e8d8529dcc55ef1ac88d98