Malicious PDF — malware analysis report

Static analysis result for SHA-256 07928eb8b8cbae7e…

MALICIOUS

PDF

93.7 KB Created: 2021-08-17 05:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eeb569b4cb79085ede2992479660bb3a SHA-1: 5417b299ca88e9df09ff6bf8415a6b63d5f62ee7 SHA-256: 07928eb8b8cbae7eb57368eb24a7b4a4dd0852608e2dbdeaf20196cc564e1e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's designed to lure users to malicious content. No scripts were extracted, but the structure strongly implies a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://communeouchamps.fr/userfiles/file/27835799554.pdf In PDF document text
    • http://transportdiverse.com/uploads/files/70685540223.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/49616665058.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fodibiwebobigosoro.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830fb71d20b---63372816126.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/kgkgv1qul6hg484nae92n85pe7/56754589417.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d480305736d3a48dd9defdf9077d104d/pejowilokazasuxo.pdfIn PDF document text
    • https://plasy.com/uploads/file/dikolunip.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/93447623649.pdfIn PDF document text
    • http://josquin-capella.de/download/momomozununowinum.pdfIn PDF document text
    • http://wmsone.com/eimages/file/98325470007.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cad6f2e91---buputufeweli.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/08715f2864b86cc9b3975152b1b57352/66750305871.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b4d5bb46---gasifuwis.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/7de3a93246ef1c5d8ba70cc59ba9e749/devifuz.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/3729819808.pdfIn PDF document text
    • https://vientangluc.com/upload/files/4266082237.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77c575a9d---jigonif.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/7450619062.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/92963112382.pdfIn PDF document text
    • http://www.truca-taoules.com/ckfinder/userfiles/files/vizigaxewop.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/67172590275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=musica+cristiana+partituras+pianoPDF 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_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10280 bytes
SHA-256: f61c085489fcacbec5995445a851c90b07393a0a6573d490e3b57b7fd2dfcb8c
font_01_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 20104 bytes
SHA-256: dda766a2b1940fcebfdbc8a7d058b22b49d5322083325d99517b3b08ae6ea4b5
font_02_sfnt_off00014e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1