Malicious PDF — malware analysis report

Static analysis result for SHA-256 347ae686ae9165d0…

MALICIOUS

PDF

117.9 KB Created: 2021-09-07 08:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 673a8d13c8592440b69714168a15052a SHA-1: 13172843c051008d7ba9cbcce480be98af2e1dfa SHA-256: 347ae686ae9165d0f60d6989f2c1c82b4426b571b46df6e8f39d7cbb7adff9c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links hosted on potentially compromised CMS platforms points towards a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a48r2mbhcacvsq27hkpnrpkf0g/42750877012.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1f768e106---piwotekawelokupuzi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/38fafd793dfd6020d788c93ae9d508ee/13623380659.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/11051586343.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3c7464985---53966808056.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5af29b399---46619228818.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/nuwokujiposevogaxufuruzu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/47937606430.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/5324338644.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/loviwumikakapegusi.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/57835954573.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607683488f5a9---20216852904.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160deed81968bf---lafagetopexegibimiv.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/31547315499.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/c59c56945b9e5f8d439ee92ae1f4e095/59679911033.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210625195909107.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/14238ecd992994574e9e618555ca5d61/ferokereredanokuzofupoga.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/wipatojatefifapezupupot.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/dixigizukasusowoleva.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b797e3fbe3d8b2b44d988ab300625203/39420734506.pdfIn PDF document text
    • https://anandalaya.in/resources/file/42883842258.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dc34ce5041e98ec7f6ee5ea379f0bae3/73832242802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=introduction+to+compiler+construction+pdfPDF 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_off00016569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16569 19740 bytes
SHA-256: 19807acb1ae28e9b9fccd4d46a1fb383b05e44d548ce34d9c1bde93d6f1516a4
font_01_sfnt_off000198e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E9 10668 bytes
SHA-256: bd29990c58681e495428f85eda72be2d47d70ecd9ebe3ae001f969776d289eb5
font_02_sfnt_off0001b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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