Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8eeae62429400f…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 12:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3c862178fea0f29cd3d2fcffc07dd02 SHA-1: e622c48703c33b0f3e0b3efc6e185503c2c2e126 SHA-256: dd8eeae62429400f089975c56c6680a32e8adcb0c665fb921ce12bd25c8cd206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites and utilize UTM parameters suggestive of tracking or redirection. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/61d04e3f8b76d30ad81f43ab6d319233/rasozajuboj.pdf In PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/dasoli.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/21959299792.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161217e684804e---nafuwiwesigugatagokimeru.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4a8ac737c---jemitelijetedinoluzuxe.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/58540082604.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210821002246_x8m3vi.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/39884709911.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/89118666905.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/006cb27a273d734a5ba45d2b6508fb1c/topomilusumutegunoxep.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c1c0164c---dufozimil.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/26765184001.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613238f6b5aad---pikekosol.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/84525e02db3cc6221f03b4c009e48bde/61847745535.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/c727fe1a8c4469daa161acadde805f9a/74941454187.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/lexadatajekibawob.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/84341841534.pdfIn PDF document text
    • https://coluer.ir/documents/file/5329671236.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/93485368908.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92b66e600---duxibizopi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b161220f3---zivukadofusututedowufop.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/26699996979.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/c2916f785d4c3ad3b7aafecdcfc84088/3659017830.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/57378696412.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/zasufan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=worksheet+generator+7PDF 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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 16732 bytes
SHA-256: 8899943efa63abbe111311e0764c66d21e2646b51888daedf38d53a942f45517
font_01_sfnt_off00010c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12418 10384 bytes
SHA-256: 4cae5344d30b4eaa273a08f53f7ecf298d48a8ec6a0531f28372cb2f1084fcd4

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