Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d55be2c43e1ccb…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 08:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4699bd010b2c62778e8caaeb9633084 SHA-1: 3d61c11f9ccb70ac44d753de5a4df4855bfc6b34 SHA-256: 91d55be2c43e1ccb85e3415950525b97475fac811a37811b106f08835e5c9ca7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed to manipulate search engine results or direct users to malicious content. The embedded JavaScript likely facilitates the redirection or further malicious activity. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://yenicekentkaplicasi.com/userfiles/file/95624423715.pdf In PDF document text
    • http://lsphc.com/userfiles/file///54298705931.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/bukagorurusoxabuta.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613210d253eac---sokeza.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/5928095536.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/36159139250.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/zafewuzonirupug.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ba81cf554---nepudukarusowefat.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/lafamebemomupewobapasad.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/44073840841.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d031e72cb69e0e55bddb37856241af38/28608501033.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/13u037ajf29bu8ubi4102m08rf/10669116380.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/6eb0c211b349900d26cb535c95d2ae32/doroteruzij.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/74857489678.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/64f7uchjcf01ltbsb8gcms4i48/78316328379.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210907012705.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210910010003.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/64104348338.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/57197735265.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/palomazilufugomufogin.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/pagowexulapokumudivinoki.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e98f959631---ganumupebefikagolaxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+heart+gold+speed+cheatPDF 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_off0000e581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 10964 bytes
SHA-256: 9d02334bc03ac03deba7b8cddb5b7d4c34d898b08bed4844c4d71ec06de98adb
font_01_sfnt_off0000fe95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 17920 bytes
SHA-256: b66f5373ddb29530b7a1c6a94ca82839f1af81476b2903bb8abc7d0cd983f441
font_02_sfnt_off00012cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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