Malicious PDF — malware analysis report

Static analysis result for SHA-256 828de67e89db518b…

MALICIOUS

PDF

75.6 KB Created: 2021-09-08 22:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 96012617127bdb847d8f44471c84ba29 SHA-1: 1883b741e17e4237c26923d3ddefe2ed919f3bfe SHA-256: 828de67e89db518b04add0f07e7ddb6bb90d3c070882abff1f6b213f72127a73
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier strongly indicates maliciousness, and the presence of JavaScript suggests it could be used to execute further malicious actions or redirect the user. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://crewmak.ru/uplcv?utm_term=x+men+first+class+123 PDF link annotation
    • https://rkdestate.com/userfiles/file/rixepajokovepubajokiwafan.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/sogaxabetetanabavijejote.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/gomafukazozexufuwate.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/91cdf5079efeadabe10a33b6734463b4/40474695679.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903173307903944zujt9s8cn8f4.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/51739328582.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/36277194356.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/niberivebojefiludobusegaw.pdfIn PDF document text
    • https://2acontractor.it/images/file/55492503693.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131469a19e4a---89193579913.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/jukevirigazisivolute.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/28602738053.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/balegewarazomebivuneju.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/67875851270.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/pirexezikavexanadosar.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/64648694879.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffa41e29a---kubasefe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///jokemodipewime.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/nogemizolegosalosani.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/33870275348.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/warugelizexobapusewusel.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/vitubitojixozojobigu.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/todogajozurekukul.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f942413514---71121384631.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/27242663423.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_off0000c292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 17420 bytes
SHA-256: 130565f85e8cba9f89db18111ea0e12200ca100087c5543702a6f271308051f5
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 10728 bytes
SHA-256: 24050b557bb24af820819030b3f9bf673f7c74dd5489c09a27ffc6a5fa17784a

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