Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ff7d7cc46d7204…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 15:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6496e32a0957c8674876b05d0d5f2c84 SHA-1: b7819b17c6ca0a0284823194f1ae666257cdf014 SHA-256: d4ff7d7cc46d72040b269ebac003239af6b7599312bf46f3372e3d086c088a25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to appear as download portals but serve as a lure for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=ace+the+ielts+full+book+free+download PDF link annotation
    • https://wodepcb.cn/uploadfiles/files/bitarivujusixudujufepefi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9mnvb6ttod28v3s2unucnsrd22/kifijikijebuzenaletak.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/17272067116.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/27160155031.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/rebopepirevetikudiki.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/bedikuxabedalefanizulo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131688624573---24786310238.pdfIn PDF document text
    • https://inarsindbari.org/uploads/87165479876.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/89305060519.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/sobigomije.pdfIn PDF document text
    • http://citranco.com/users/files/salesufekuvuwexenosisi.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/bilatevowabupo.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/53841785602.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/48812947810.pdfIn PDF document text
    • http://toonesk.com/upload/sugozumuxefarabuv.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/topulejolevufito.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcd01d864---gepesatos.pdfIn PDF document text
    • https://digireg.com/upload/98575240386.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a70cd98a607700a03710b46f4182c429/lafanokiz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/deriro.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/45186637367.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dd40fa506b---zegojepivotenugofili.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/650966300.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090623051199.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/gafidalojevutakadu.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_off0000b3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B0 10972 bytes
SHA-256: b99c060277a63e9e1cdb77b892d0ef8338cdaaf575454ca6163dc9c0ebdc6aca
font_01_sfnt_off0000cd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD31 15284 bytes
SHA-256: 052dac62d4bab0559598ca75a187ab933028224c6304acd5f011709c20576254
font_02_sfnt_off0000f31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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