Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c98bc2d10d7ca39…

MALICIOUS

PDF

82.2 KB Created: 2021-08-01 19:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afd168ba84c0d714cb24ae6bec070320 SHA-1: cd22a8a0971141834fc2e7d4bfcf6f31e52b2c39 SHA-256: 7c98bc2d10d7ca39d5f17d2479075e1cffb90f07ca706a6b55049b52927ea1a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed that the PDF functions as a link farm, containing numerous embedded URLs pointing to compromised websites. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://apartmaji-zunicmile.com/uporabnik/file/45283819879.pdf In PDF document text
    • https://upbfassadenbau.com/upload/file/nidesovupowugew.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m5h1d74i8j74se94jcqj7cbo3u/20148054762.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/89601414226.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c2daafe3e---89930473365.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b02bd0e4cd---wubiketivi.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/33333862707.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/320298058.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d801b5fbc---44588137486.pdfIn PDF document text
    • http://yilip.net/userData/board/file/wizadadavovarodireje.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/98396773190.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610071fe86839---43409470171.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fiwabufis.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/wenimemaromi.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/bivaj.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/uu7qce5ihcehkiuh3g24md0tj3/76593989981.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/newotiporesije.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/e7f37bd5ddbef60d28e3e0008a87ea1c/lomobesijinoli.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071dae33e540---84896795395.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff76b09988---rusukapetej.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38be99a9be---suvibanitenuliguk.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/neseguwawujunomomeg.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/nugoranoti.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210716_201341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dia+feliz+en+espiritu+y+en+verdad+descargarPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1F3 11016 bytes
SHA-256: 0e2700e1ffcab70206bd6ae6429e317038e0ee09bb85ed5e591b93d1d202c5e9
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
font_03_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 17792 bytes
SHA-256: 5c460363af239adfcde03ec5cbe900a4c6f716f9793bc90e28662ae8ddcb2316