Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f067bb14583476a…

MALICIOUS

PDF

88.2 KB Created: 2021-08-14 02:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62d3f0dd0ef19c6dae35b5e532a9bd20 SHA-1: af7a9fe69192acc54d1f11199f003994488d78b0 SHA-256: 5f067bb14583476af9afc70e99b7feef08f51b08cf8174c2cb3cb0d0429afad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting PDF files. This suggests a link farm or phishing lure strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f7e3d637a99af83c90d47dcf0b0b8eec/8984186459.pdf In PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d8de49dd6ec3a5225f836847c12f0d68/tebokegikuwovofevumuz.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/9557631371.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/22225209384.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/lexugebijosoxoluk.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/c2d63110b15497d781fe6f8d0c228869/zibasirenuwunutapine.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b329e0b89e4---22775585787.pdfIn PDF document text
    • https://ultralloy.net/upload/files/dinem.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/wanerasopusimawerajapu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/genifisebigawirum.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/53932434000.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2039c411669bab41ce61efeceeb47581/vebafajubipupawanobuzoben.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/23477933506.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fulugikawavonaporibo.pdfIn PDF document text
    • http://gardatrans.com/content/Files/nigako.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a837ad62329---9749309826.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/29762336271.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/21353356893.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/jazekapuzixemo.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/xeriduxubetuvoperavurub.pdfIn PDF document text
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607056cca02d6---17392016143.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/14832225051.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/20001214059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=episode+mod+apk+download+android+1PDF 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_off0000f211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 18124 bytes
SHA-256: 8af5f3cda187d40cdeb2fc7b66b1cf64359bc983ca3eaf1b035e06cc2bb6f48f
font_02_sfnt_off00013a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A25 10668 bytes
SHA-256: 9315d53d2f5646fc9fc58d7b99cb57f44871d2f77d86deea3e7003fba8872d8f