Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85fb68955588e7e…

MALICIOUS

PDF

89.7 KB Created: 2021-09-20 19:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89957338ecda269e137d2471b36303ec SHA-1: 969fbbf12c35c83335af54f61c93e6a1a2245de6 SHA-256: e85fb68955588e7e7634f55068801b2ba463a7f00d5fcd8cdb85143a4b96d453
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, but the presence of link farms and compromised hosting suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pixomot.ru/uplcv?utm_term=watch+captain+america+civil+war+123 PDF link annotation
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d9d9be58---53891461626.pdfIn PDF document text
    • https://blugarden.eu/file/31922264028.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/dezolalukiragamu.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/vawesasevuzu.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/gubudovipi.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/difibip.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/rokaxaxulawemifa.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/63594967131.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/jobubejopagatuwij.pdfIn PDF document text
    • https://infotechsystemsonline.com/ital/www/img/file/24531636830.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/70417603579.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/gomeralutokupupomo.pdfIn PDF document text
    • http://balone.net/_upload/file///dagejapofafotedonobemat.pdfIn PDF document text
    • http://naviway.su/upload/files/loxudulegokin.pdfIn PDF document text
    • https://ms2oke.com/contents/files/salufujusoza.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a79c6a560---6248685539.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/jukine.pdfIn PDF document text
    • https://maintogelonline2.bet/contents/files/13555590343.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/sogifokonokumurovovov.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/90558450198.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/zeseramugifitumomisuwil.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/92557754998.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614091951bfd3---gotavuxuxulubuwasabeg.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/kefuvufomevemu.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_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10840 bytes
SHA-256: 286853b094f5075b14ea4e8cef9eccec5148289354dceb7fcb1bd682f272bba9
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 19012 bytes
SHA-256: 6ab250d0c63f9ab4528501a599b5682c31b739a7a8bd140a3ea181f091c61f25
font_02_sfnt_off0001412b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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