Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e25f1811e3e1341…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 16:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e331fcd98b7aa7d6b7a148a2eeaab8ed SHA-1: 832fd82908822742b2f99ce81cd24de92c3fce95 SHA-256: 3e25f1811e3e1341d4659431432c94f48c40c2e40c805c049e65966cc5d77169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=hatha+yoga+pradipika+pdf PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614088a05e32e---garogukujuwapalodutemetef.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/36543526947.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613524204c537---bepijetexisepunanidijozo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ac0d7b42---52422660784.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/nekolabamagozipedi.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/limemaremojuxuver.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/mepafelazexitupexuwire.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/58225665667.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/86151234384.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210913/files/20210913215800.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/96676397614.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/wusulelijamidiweloted.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142f6d71a248---27090722118.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4e9a2d67b6b65248fd76ff7e08aff258/80167352298.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/9220937452.pdfIn PDF document text
    • https://motecx.com/images/file/11823287578.pdfIn PDF document text
    • http://sbcnepal.com/images/file/kimozazuwawiwogi.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/9936690987.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/81713694310.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/25752855004.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/lozilukuvefusazijil.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/46134296341.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_off0000b9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A3 10524 bytes
SHA-256: c8605b316ffbb3b9911b7fa8e3037bbe40a40964577ff39b726004443eb51b6f
font_01_sfnt_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 16176 bytes
SHA-256: d4e449bf82399d52590b61887031487b0cf11c6f4c7333f579895aac0b4ae0f4
font_02_sfnt_off0000face.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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