Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef94759ebb9f7cef…

MALICIOUS

PDF

76.5 KB Created: 2021-10-09 23:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68effb4174073625c37ce1c364f43796 SHA-1: 9a52afc725f496fbebe097421e95037bff1c4095 SHA-256: ef94759ebb9f7ceff4872c1ec6aed064c95115ff1c5852a7196f904e963f0ec0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://5of7edwardstreet.com/assets/media/files/luzus.pdf In PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/vugebikilurozonumokifos.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/39846007752.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/58269230075.pdfIn PDF document text
    • https://uudanbury.life/files/file/17077933253.pdfIn PDF document text
    • http://centromp.it/userfiles/files/63502141575.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/67bf44a16e86dddd34caf27767081bad/xisid.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/punudupisugofowu.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/sipozimipumotetupidakuso.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/adaf72b591abcde8df83b2521f9393d6/zozuxoguk.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/9c0ecb8468bc97778d40a524c8d4fb69/40315660187.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/20925144119.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/81648954986.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/vamewobewukoken.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7e33b2005---26633517901.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f283b8df---32281027985.pdfIn PDF document text
    • https://khanikango.in/file/bupavutijukefurinajizoj.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109080205014782524pajs0mwbnmf.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/73770668983.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/nsi64h891sma4o2ardunrchj57/farigam.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/72049369395.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/34898479170.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wosimiliwefem.pdfIn PDF document text
    • http://carszana.com/image/upload/File/45135123489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=charpit+method+examplesPDF 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_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 17580 bytes
SHA-256: 88d02aa469bfda4129ad83f3438c0226ab25601ccfb16b0d6c1f0f9496386012
font_01_sfnt_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 10688 bytes
SHA-256: be4d965053f3db830f6aff739470ed098793dc16c11d4d8a3cbb8941df97ee9b
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1