Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e2f83fb20b2a78…

MALICIOUS

PDF

74.5 KB Created: 2021-09-19 13:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51674624284c425fa15c60c656685051 SHA-1: 58749dfac563038acd0075f84f0e7ad331ef011d SHA-256: e8e2f83fb20b2a784949382f69233ff31ad4977c858b4f4ba32a4434b8820482
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links are hosted on compromised WordPress sites. The ML classifier also flagged the PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • 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://konteshamamotu.com/userfiles/file/tanagadedumidumizozet.pdf In PDF document text
    • http://boathousebrokerage.com/userfiles/file/52743907886.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/113215477.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/rejomiguzek.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/84617631287.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/xonakabitofoxafebomun.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/27644645392.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/xulejepomesewoxefebi.pdfIn PDF document text
    • http://cy2hand.com/userfiles/82929940937.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161317fbdad391---runodevizokuvuba.pdfIn PDF document text
    • https://polandpools.com/contents/files/fadubatipipomef.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8s7resr1fe4051cpctmk08dev6/golipizun.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/93029137418.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081054042989.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/vesidinotet.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_5DA6F44DB66F94DE.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/zifatosileri.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/73517909862.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/59257662107.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/gufabuz.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/98501306081.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/46348983028.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/28886975516.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d5c2d8b1---gopeb.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/209e0a8348e577aeffa0d013b349fb62/lokizevarogeru.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/selotukelanagojigupoji.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4ce3a77a---wuwukabofizogazajasewerod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=rk+online+matka+app+downloadPDF 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_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD523 10508 bytes
SHA-256: 8afa346a66d1abc323019fcac18b865dd8574e7c6d1d3c264d2714d78eff2a9f
font_02_sfnt_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 18396 bytes
SHA-256: 14ce573f3d4a4d66c3de53b030c9ec3ea751f754e18d2c6763d7faf128879f1f

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