Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc2e4d19b45a3f5…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 23:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fb1e1e94153d29a58f3014b65331212 SHA-1: 635ea1eebf315aff928dd2600f86f626fddc13fa SHA-256: ebc2e4d19b45a3f5d1a1915b5e962b65649ad6ae41828b21da86417d67175a67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farms hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smaransaving.com.np/ckfinder/userfiles/files/wewunopolosot.pdf In PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/18788720153.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/mfe5potjjv683d335iasrhv9p2/putewobipediw.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d2c2c7ee---panetinojotarijepudalife.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/47235127895.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a7bb906127---40397336005.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/xiwizigevuvutab.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/e02d627ffdce1aec9c28feb895eefc84/sumozopujetiwa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161062dfca8aba---dubozaradavivuxavafako.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o8l6um5vhke7nt4l177i44s9o6/lebedulededanitir.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a28d7688c---zapijosuloxitexiji.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/56827306810.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/zirasozula.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/ooel21qa4jfnsdcobtjnu9uciq/rikaxezofolezuvo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9m20tkcvd9sfn8pvfnhjsaqo21/gepozotowewujoteletiniwof.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/23100071085.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e74bccaca---38245603293.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/69365325949.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/gupafizuwaxupow.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073909b2bb1f---mofemaxefiri.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/kuxunefo.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/rofaworawojutelinezuwo.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/52538738805.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/dadulerepotipelep.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/57981317096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=export+pdf+to+jpg+freePDF 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_off0000be7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7E 16308 bytes
SHA-256: 4bbbe758259951f5e9f3a35e5f64f1e0254a7d5d116e8f4ef4f6536007796cef
font_01_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 10316 bytes
SHA-256: 48198035cf147395d9349edb4b9be8f1cf30c6a554025375e4a0084ec4b3edc0
font_02_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1