Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9189d5ff0c3aa6c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-12 04:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8e9d5ea235c7f1fce54829acb5affd2 SHA-1: 117bbe80f4126c4cdb92e10d39328434da3b381b SHA-256: f9189d5ff0c3aa6c8c9f8ea56376ef59d7854526086c534fa435c6d396814dad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised websites or disposable domains, forming a link farm. The primary lure appears to be related to downloading a game, as indicated by the 'utm_term' parameter in one of the URLs. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=wwe+2k19+full+game+download+for+android PDF link annotation
    • http://sicilalluminio.it/userfiles/files/vejesozaburi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5cc81224c---porubagafaregiguwoga.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/topimituvodamij.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/viribe.pdfIn PDF document text
    • http://arsvet.ru/img/upload/roxaruloluxa.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090500231973499.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/ruwivibalel.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/fiximewuxujonomov.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/2985760637.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/wanimezuwonebomenovim.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/44539026172.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/fagafoteluzixajeti.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/dosajaginafavirulazabaru.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/55203046839.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/98695246145.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613120865c1a8---damin.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/sozaj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ede9e06ac---20812650644.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/95539789195.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/34447264833.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/43518604150.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/58500244194.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab2925a43---depenivizasafuramaw.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/63584346683.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_off0000b425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB425 14976 bytes
SHA-256: 44b496a5a559a405163ef690507f8d4c2292058ed9a50dd8fa3d790eeb2e0655
font_01_sfnt_off0000d9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FB 11044 bytes
SHA-256: 4dc2a944d722429ed344b8b7444b7fc6151e36de4b77adf62cb6f6e68d027098
font_02_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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