Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda9f2ac7f490a5e…

MALICIOUS

PDF

98.7 KB Created: 2021-09-21 02:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c41ae598e26c514c85337a107fdb04d SHA-1: 5fba1a1531cc8574c5d264911c35c49651e30db5 SHA-256: cda9f2ac7f490a5eecb3d288c6c619a13cc2cc78bdb4da26ecc5cd92f7508054
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised websites or disposable hosting, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a download button lure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sukhayurveda.in/userfiles/file/godid.pdf In PDF document text
    • https://zzwgjx.com/d/files/34015450959.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/kizaxodezetiremar.pdfIn PDF document text
    • https://webmenuplus.com/images/file/18983269043.pdfIn PDF document text
    • https://spacio.hk/attachment/file/21069938073.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/wavevikudisatozutetijal.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/82917048223.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/dofovuvo.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/41087488176.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/61346219404.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/37409369070.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109200106344194.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/nopawazevemufugobavuba.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161369b3b2488c---zavupukagowe.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109081712033439.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/ruvesike.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/27ed6ac281314992b1c7164bc7f197a8/suxivevidikeje.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/50389174486.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/48352354140.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/jegalelolagineg.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/botamubopazakekasava.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f1svve6ci3kgsfvdo1975pfmk6/47816117621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=es+file+explorer+2019PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 10536 bytes
SHA-256: 36b41827c3babd0f20d11aa7fef133b0b13f088c82a48907901d68226f033dfa
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a
font_02_sfnt_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 26632 bytes
SHA-256: 080d65ca6cb167490359cad64062a0f5eb013d8ad5fcaf076d3d473c5538be2b
font_03_sfnt_off00014cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEE 16692 bytes
SHA-256: ddc7256cf43cc0f4ad207b15e95b5a2b271583d00a8a1f6033f7f7f7685cbec5
font_04_sfnt_off00016477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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