Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b718ca5cc8571f2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 17:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40782a7b2cc2a9e9de5afe7a87a149a5 SHA-1: b18010b6a5334dfdad72d5f988de0e780bfb89eb SHA-256: 1b718ca5cc8571f2520cdb8126bc5581b4305bcf992234c2bee807bc4427b1f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised or disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to redirect users to malicious sites. The ML classifier also flagged this PDF as malicious with high confidence.

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://catamma.ru/uplcv?utm_term=gta+san+apk+ios PDF link annotation
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/103431325.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/rudexolepug.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/rupudepufudagubezawavezo.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a43d60e---76503214044.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/54321940460.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/84113388087.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/fajesimofuvedogekuvolow.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613757432946e---30345279252.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/bf64doef69oeo3t8mk9uc24u14/muvedezabonimevinam.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021090724558_849263729.pdfIn PDF document text
    • http://wenxuezj.com/images/File/84601794100.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/75173525627.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/81854206548.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090603432826.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retawenovuluzefiwa.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/wufoja.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/55412144930.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/21811318188.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/pamawafuwiwuzajodafusutex.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/21607972322.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/1184731313.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/bitigogo.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109110509139156.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/buruve.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_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 10096 bytes
SHA-256: 000c7b7a105edf4657957ac0e0241ee9b914363ffa00eca6ce88a66898090074
font_01_sfnt_off0000d63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63B 17056 bytes
SHA-256: bbbf50aa63251e22ab9e6ccbf2b963f26d5ede904a6c8216f9b66bf3c470c4e6
font_02_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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