Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b828407e0c1da3e…

MALICIOUS

PDF

90.4 KB Created: 2021-07-04 05:49:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3f662eb325869d428011449b059e2cae SHA-1: a7ec59a1c8c367e17a527afe2fe512f995ca15c2 SHA-256: 4b828407e0c1da3e73a3d1843a33855dff4c3e28990d2fa4d4b3ad883726d807
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://synerhu.ru/uplcv?utm_term=names+starting+with+n+for+baby+girl+hindu PDF link annotation
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48501d033---39439183423.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/d70e93cfaecb575c8f948ea9f9aece7a/jesebubodajobexafi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/1a6183d90120b895758717a18722c72f/zifepefojawisawusilem.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075469d07b58---zotimu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106300643.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/bqlc3c5nib66keetsqkrnfrg8f/90892227408.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/14918186640.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/de9c370388f501289f39c38f779907d3/5679617387.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e409622fb4.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/94612082428.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/zipewuxez.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/90f38f2dedb96b894f60ab27755ef906/9170775655.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/5e753fd9bbb9de4b38b249ef8c7ee0b2/wegemuzejorana.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/70d9f01393926f87d4dbb94cb694ad3b/59872399465.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/4342900476.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/jovisowoparezetalekuva.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/musomividefubafin.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfc5bb2ef---56058711550.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/38660116982.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/durulepawateperajenepe.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/74374605538.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/maxonemanigojelakug.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/48c17d8b4a44103faa4f393d376a04cc/28392126304.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_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 11216 bytes
SHA-256: 3e1d469e61c7a7fd1a3ccb855b8b7f1cdab51f71c26fe5445eeb37405eede8d7
font_01_sfnt_off0001157b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157B 17148 bytes
SHA-256: 65319e6c3cec71d3cc54cd01a7ab7648088b30d70353fd28afa1c49f13ca3b9a
font_02_sfnt_off00014255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1