Malicious PDF — malware analysis report

Static analysis result for SHA-256 b893e2d7c26f293b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-18 14:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ce0893aa40691446af89bad34f75dad SHA-1: 31728ae162ed2dbd3791daa1a232fad0e2695a46 SHA-256: b893e2d7c26f293b3bd8e6b3f2a8dafcdc0efdfa29978850565f015b398daeca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/1e2p546d9cgkdoga2lnlggrge1/jiwosowuvizuvofilonun.pdf In PDF document text
    • http://tries.cz/media/images/upload/file/ruferagumigobakoz.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/jamamadofabeno.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/tituxa.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/gileterabomovu.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/1050706527.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa3024f1c5---53759223631.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/xezanugenuwuguluduv.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/43571755545.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vepabotikinovitanujilaz.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/finuzuzelexezexelododi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/42625721584.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/rufewo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140811c6f2fa---12415972821.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/pabipal.pdfIn PDF document text
    • http://msiutilities.biz/documents/45531811863.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/labideginazedixo.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/31782162164.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/zagebig.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/bivazel.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/woxobafujutomolaxirofajoj.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210902125911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=final+fantasy+xv+new+empire+mod+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_off0000b86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86F 11096 bytes
SHA-256: 0b0966ba64f9793e956e005b519f26e5bd37a2b59ef6f7fc5b558e8aed436ae1
font_01_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 20292 bytes
SHA-256: e7b43b1e31df5d461dd6bf74dd9da58b95189c65ba434f6a8e9d34ce9a15dd8e