Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fd96c3650ed86db…

MALICIOUS

PDF

79.2 KB Created: 2021-07-01 09:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49fc0208bc3b078f9842be7d78e5f976 SHA-1: 36b8393d7d6552370547f3d9f0b9dec1a809f12d SHA-256: 1fd96c3650ed86db4aef50b4a0bd95687dc99a65c31dbf38d68248e50a158be2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and the ClamAV detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a3440081d9bbeb38eee7470b6a082fa2/78647749362.pdf In PDF document text
    • http://dekoblickfang.de/userfiles/file/rawuzitatow.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/xurogudopojolojoje.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/2f7fd90cceddda7e0658170cc65739d5/lowagesurivedevu.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/zotas.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9b0066---julofoju.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee39277ced---pararasaso.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/2f570bc03a90dfe0c5c8fc51a77ea3ee/18596638938.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7f4b7e13---fetowavebolegudosori.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d43860260---felarolidekuradiwofukuw.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eb829c8f9---7943023241.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f64c4fbc1a451e0bcabad4d0c3dc1da6/kojefimopeje.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/cdd545f15a5d08f9ec4bbb7602c6505d/wexojifugafuxare.pdfIn PDF document text
    • http://webursitet.org/Files/file/45985974948.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56db2aed5---38598506961.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/93bdaea0e0a8fd97be46c047728e399d/94012256475.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4d74ef9b---gafavaxajiriwabupijur.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a254d52777f---77209314796.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acce262f1bd---65065677338.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/xegafezalixevokutetogis.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/61096705746.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58100a75d3dbb7c1751517250aef61bb/64228481250.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4c66549e4d0c171509035669daad4b37/gazujirupag.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/milug.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fajuxoludozawuwilunojug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mature+naked+imagesPDF 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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 16152 bytes
SHA-256: ac63d20d2023654c787290e674899aded0d7e310d84f046140bee9d4353322df
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 10608 bytes
SHA-256: 1366ad1c27c08b3e3dcab6b468cf422ac6c50ee13b44fda6b11eef57826dfb0c