Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea05607f6a89269…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 16:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e0ba5a5438594e21417aab04fa3fcc8 SHA-1: c6650e3c4f3bddc8c3c4a76407828cb6d01c2527 SHA-256: 1ea05607f6a89269c4735c1192cdea0f722f70b1dffcb0ff0520754f2623ad18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, with one URL specifically mentioning 'download game'. This suggests a phishing or social engineering attempt to trick users into downloading further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of embedded URLs points towards a downloader or redirector pattern.

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 http://internet-trade.eu/UserFiles/file/dunaxubegatikuroxuroro.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16141a62186c02---nefofimimoron.pdf
    • http://bafiti.com/sklep/userfiles/file/36316137942.pdf
    • http://irfanmakina.com/depo/sayfaresim/file/28044388679.pdf
    • https://indiantalentjunction.com/milan/media/danuzusat.pdf
    • https://kalashad.com/userfiles/file/badubomefugoxadadidor.pdf
    • https://ntiverification.com/userfiles/file/wunemerawiputawopev.pdf
    • https://hebatkeren88.com/contents/files/75809956792.pdf
    • https://ecotranslation.ca/upload/editor/file/diliga.pdf
    • http://residencecarlofelice.com/userfiles/files/bizefakudodebusazobajifu.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/wosivadamatovenanazuv.pdf
    • http://mtt-association.fr/upload/file/piferixa.pdf
    • http://mynigaoe.com/upload/file/20210904191257.pdf
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdf
    • https://jeneifogaszat.hu/cikkdata/files/28214613184.pdf
    • http://synergienetwork.net/userfiles/file/74475522071.pdf
    • https://nghiepvu.udicmanpower.vn/uploads/news_file/xilaw.pdf
    • http://mengnuanua.com/app/webroot/files/files/difopilididupikagefutima.pdf
    • http://wajl.net/img/file/2021981718.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/10931818934.pdf
    • https://bisnismedsos.com/userfiles/file/luzajuretafakukalasifob.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/jekanezaxirufed.pdf
    • https://skillmapmagazine.com/ckfinder/userfiles/files/rafuxor.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131bcea0ea98---32933492569.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326dceba9db---veboxedi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+game+need+for+speed+no+limit+mod
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf9e.bin
36b65006f448e24f7ee955b0b904dcb36d306e7e65d6fe1cb6792a8fcdaf5997
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9E 17996 bytes
font_01_sfnt_off0000fea5.bin
97e48ac2966da4ceff2ba2e3c7cca7c340a850112b8996cbf935cd313b02a39c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA5 10928 bytes
font_02_sfnt_off000117c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 16792 bytes