Malicious PDF — malware analysis report

Static analysis result for SHA-256 a602d7525448fa22…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 05:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83e9b961cd06d3315ff664525701caf2 SHA-1: f48b538f8650600ac6fb2b5fd384fbb14cf41a16 SHA-256: a602d7525448fa2243400db5a0da3f0089b81ae6c6e00d4b0481f95c016c49d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised websites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=android+top+grossing+japan PDF link annotation
    • http://onishi-kyosendo.jp/archive/56089220135.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161353441612a9---29929520033.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kodelumujinewefepiwukojob.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/janimidaduwifoxuzuja.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/zugujepulijozilidomi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u7ule7eot5t7636978u8g7rh82/mezarodiridizomik.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f14ee0a58---nerepur.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be2d04ccd---23677916232.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd61a7674---98968184890.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/72680210084.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/13654423621.pdfIn PDF document text
    • http://tano-cable.com/d/files/97401043256.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/linevofij.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/96155666397.pdfIn PDF document text
    • https://esvigo.com/upload/files/wulex.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/32473218312.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109090749332635.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210904223513.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/tiwilisiteramawuraw.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/72886892732.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/87447495259.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/16537268266139c59d04e74.pdfIn PDF document text
    • http://eternalcycle.com/FCKFiles/file/18745516303.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/32727387613.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_off0000b773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 16984 bytes
SHA-256: e383c56789e850c0aa381bc45432c8cbb1481f414e8565241f553af9d69a21ad
font_02_sfnt_off0000fb93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB93 10500 bytes
SHA-256: 93a6657bb9dc4d492f691dc2e623fe88d2152cf2a10f637ae3dbaa27d275b992

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