Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ee7c9a10aee33b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-16 13:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3615629e6fc0af7b161d93101f87e46a SHA-1: 64c884b0bc48b59db8b279a83c944d03ae8821c6 SHA-256: 65ee7c9a10aee33bdc8190bffaf5d0aaf66fb2d10dd54661e317783f6cfe7171
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download an archive, which is then expected to be password-protected. This is a common tactic to bypass gateway security scanning. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=tubemate+2018+free+download PDF link annotation
    • https://needletherapy.eu/upload/file/libijatibisotejonuva.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/5665348266.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/19641857863.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/43894488738.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2d2aa9ef6dca3fad2ad6ceece95cab48/lonamililagij.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210914122153.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/sovovim.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/77908991959.pdfIn PDF document text
    • http://belniig.by/public/file/xubinerolumema.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16132231a34dc5---zemimobivafubakaterun.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210907010808185.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210907_99001BC5374ED664.pdfIn PDF document text
    • https://ikansambel.com/contents/files/73034481712.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/durunozumujiga.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210902005807.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec3dcdfa31---19848564703.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/motibosegivimamusijosama.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16141bcfa9bcfb---sosubomotuxorova.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/luresunoxogu.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/kakazipipiwezisaluv.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/lagabuwixifamovesit.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed0037317---57833321523.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/vuzifawobozabotuf.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jerigifas.pdfIn PDF document text
    • 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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB02 11048 bytes
SHA-256: 665c7d4aa99312db5a7c2cde23e58d6a935329f832c26b4ae73f079b4206522a
font_02_sfnt_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 17840 bytes
SHA-256: 5d74644c7de97fce944ec494fa7ed416fae9e1c089f611c44877b912d8b553e5

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