Malicious PDF — malware analysis report

Static analysis result for SHA-256 e09b64e27b1aced1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 00:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc50e4e8d8147e77461fcbe183d7433a SHA-1: 0ce6cc8968f5813a4648a2788b8c276ba9f9fde0 SHA-256: e09b64e27b1aced11d16b2dbf0ab2cd1fa27b4d79b4182d3f4441488be142d47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics point towards an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/suromutilusetob.pdf In PDF document text
    • http://gorod-r.com/userfiles/file/xuzebametilufe.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/67828062353.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/muwonapi.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/kefumamowutupumuxena.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/sipinibojugesofewitumono.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/94617874940.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/15006263144.pdfIn PDF document text
    • https://dm288.com/slicice/file/81520027828.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/soveje.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/39281108356.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/dariv.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/36275896189.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/bejipenakobimiregav.pdfIn PDF document text
    • https://ccskin.com/geektic/files/43252306671.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/75601033249.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/fefexexokofir.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/wivikasepipuzidazo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4f4c1254c---gurabamorafeso.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/91444067252.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/74848279653.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/nodajilirasorerosezob.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/5971198857.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/16989228957.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131579888e2f---57898832774.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9540f0b56ed8eb65eb9a260b1c0af2b4/70811504921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=quickpic+premium+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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 10252 bytes
SHA-256: 37ae1e86455c70a43e42ec1d16c9866d440c58ec3b94a8f2f5dff1395178b9fe
font_01_sfnt_off0000f12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 19068 bytes
SHA-256: 4a3453ee992afd7160705eb192430d259aa8c92109468c0b292ce69bd1d85bcf
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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