Malicious PDF — malware analysis report

Static analysis result for SHA-256 bebef865073253b0…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 18:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ff14919e82f609ac91678d851eb9f58d SHA-1: 5245f7d40bbcc72e78a8287583bf2397af47bca1 SHA-256: bebef865073253b0b7a2c8dff17fb6c51541b8a5b32f16dc72a160111a0a74e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns suggest it's part of a larger malicious campaign, potentially using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c31925c12---11925547747.pdf In PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f469f454601---zexepotenolozitefekipaf.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210629090732_xuz7by.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6664d6456---94898714522.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/pufeguviwufaraseni.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/da25e451da15dff30ddac8838325eb26/pepud.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/c89f2be9f16c84f56fbc9021a0141e7e/kofelixupuvo.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zubexunota.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cef98d63b62---59117584352.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/3476883013.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/tigoke.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa2a59634---monenatiwitex.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/womisiki.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/86166194ef9994e655e8e7e43e68a07f/xoguziwabotirenowesovapem.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r1eql8mj2j5a5r6roesj6vhqqa/taletewawedipi.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/48602397820.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/75d6bfc6dafc291460d4ebfc44270215/86372352145.pdfIn PDF document text
    • http://ibb-online.ru/f/file/moledidasa.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/29001049146.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/tawexetiniv.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/80136048602.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/melofo.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/mizasiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=medical+doctor+resume+pdfPDF 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_off0000d8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CB 16612 bytes
SHA-256: edd4e96773f5d4bea6c132c8aa17b87893d5d0c8cb36ac560c6f617e9b2a9f93
font_01_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7B 10768 bytes
SHA-256: 850a50feec50b6a5e4756b29b21d4c242c5c1b05cd8b82f18328c24bb50cb02f

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