Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6913ed5c4def6c6…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 13:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 5bf187ae8c0a20c26935cabe292303bf SHA-1: 0f1700989eb4db5597f680fc45bd1166536dcf26 SHA-256: b6913ed5c4def6c638d7db9502fa9dc1ecbb219a11a159bd7dcc297128d26c99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF document exhibits characteristics of a social engineering attack, specifically a lure for remote support or recovery secrets. The presence of numerous links to compromised WordPress upload directories suggests an attempt to host malicious files or redirect users to phishing sites. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160808f2d336cb---37956945627.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4734b857b---39262265476.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/8aa310cc931955b252877f1d29f1a35d/gebuzenavuvajopa.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2680b825---37246026414.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/87280362429.pdfIn PDF document text
    • http://alltechsro.cz/files/vezojitelikeriv.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210619_F25D8731E357AA1C.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/31643607898.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/77609549960.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/0l6ri5scqekd57u22r6mk1t9a8/javajuzupazagor.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb393571d77---14753310874.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/ac53475c83e1135ddd890f412bbba1cc/68867726355.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/38248951828.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qkgqc0fuh69bj58afb9o4kfi8n/20698995182.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/1a88c0156231f03862aaf01164130de5/5752215694.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d9298086305abe21612a30a0b8a5b5b0/govinojijikuxadezaton.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/p1cvgln0ucrviphrcnfl394m50/98474353940.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74132585e---85596809790.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d717cadc---zerazubasuwuwoguroxuvo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/872fe7a0aaa6c60912b72f52d278efc8/71709964598.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/ledamupewi.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/zodifak.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b3693d39---nolapibukozotisibid.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/41566012389.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/fef4c426ee8b9f273553b4f8dcd2615c/dupiragaxiboturop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=uninstall+teamviewer+mac+manuallyPDF 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_off0000e885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 18164 bytes
SHA-256: 3c79dea99be6d41b62ff6b1a05706ba9facf71cb61d046a7f2319523b870c06b
font_02_sfnt_off00012f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5F 10644 bytes
SHA-256: 1456e605b671c687da0d058f1de11ee859e00b3005cf3f892fe5ba40431c5181

Open this report in the interactive analyzer, or submit your own file for analysis.