Malicious PDF — malware analysis report

Static analysis result for SHA-256 e110129aee28490d…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 12:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d77745d1704f61e1883a00e340534bb7 SHA-1: 5a6ea66e01f8354b6f04c5839a601bed9b0bd216 SHA-256: e110129aee28490d180bb5990941366cabf02ecbfc192e1e2a16c84ba97b1d48
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://mnarch.it/userfiles/files/fipupux.pdf In PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/tipipexusurek.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/zujefojotexo.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/vubuvog.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73621cbd5e---temugakoriwuwerazofeteben.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68fe14499---22053384941.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce1947162---38030449785.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4cde4831---dudewepixomagikajujave.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/suwaz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/e1887e8d6db9f45abb789ab8a666a27d/96733540341.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/pigemebudoziga.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/91438389735.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/je5cq6c5ce3cp9kdthuh4k002o/75130032603.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4d352d935---mixixeja.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/535726968.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/damatolape.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/46148034852.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/7435652024.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/padenivototis.pdfIn PDF document text
    • http://mfahk.com/upload/files/gavogimilojubo.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b655eebe187---mirula.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ecgt4rh6v1bsf1id2akeo714r7/80627358527.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099d69b9bbb9---55385212873.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d34a008916e55df8773e6335463b7b03/zaxotenunevobive.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/54715123421.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/rmm2q7t7ras91lfco1jrukjcfp/zubifuzokeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=key+components+of+a+product+or+service+specificationPDF 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_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 11004 bytes
SHA-256: cf47641b53b9058d6af89e3310777f2fd6dde3197728c5c606d81b0350faec51
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 16648 bytes
SHA-256: 886efbaefb86a23e0b66f55213e43890aad76bae69c45036d3eab1302988278e
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1