Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd434cb15df92445…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 18:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13a4817132e0eb621125317e3408e278 SHA-1: fffadf0896ac3deb095c7630d9c752611f4153d4 SHA-256: dd434cb15df924450dc0c493be51322edd8e41770eea0bdbc81a0e2d2bc2dcb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=introduction+to+solid+state+physics+c+kittel+pdf PDF link annotation
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/vj5a500j829u80fq9612cf8qj1/nosirazon.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pehhls276mm62ndrdql8mgmms7/19503505752.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/kidevidipazur.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/vokiwuvorilavi.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/nakuzotomawodubinip.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/gewogugerugokejere.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/zadevifawepojukitafo.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/jonamu.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/nejanazorotabavepa.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/karevikomoxomux.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/85436870077.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/zumizedevefid.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/zapumidonel.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/82701201995.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/vawuxamu.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/vulufazususimixoxep.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/masotu.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130927cabcf2---wuwejufun.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/93816578029.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/midudir.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133644abd4a6---62440600853.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/dufikipekurus.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/r434o8kealku9353u5blpqvqkt/12259349559.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/54474910447.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/216510552.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_off0000d3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E2 18176 bytes
SHA-256: 394fdaa57e9ccc1e826ea0995b58f3a0843078f38d5eba97fcfa47382543d31e
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 10976 bytes
SHA-256: d616cad0a083438ddc73d2270198d5ec3378519e932e062afdf480dd4b1143e9
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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