Malicious PDF — malware analysis report

Static analysis result for SHA-256 364ba9e1ece6cbf1…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 05:25:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e0e40041f6f125e567ca75ba8e160300 SHA-1: 8531f00792f181f52f3bfa625cce60754a9911aa SHA-256: 364ba9e1ece6cbf1ffdea065bef10caf129939a773a93f3dbaf829f4493d0610
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories, likely intended to host and distribute further malicious content. The presence of these links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66dd7b410---30986059313.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/oriluduz.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205629a279---12283688021.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/xeduza.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5d4cc1e21052d93ef529df498136d7b0/jirajobamasuxexopenu.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05faae7d59---1308701111.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nuvumetuburabe.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/slmbiqu6a0s7hj1slj15fa450b/lonujuda.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/78196996114.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/63971177430.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbd86538f---demusi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd04693b47---fopaxeno.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/b1f3fec210aed8cf0fdf6cec867c28c0/xenozijaw.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a338814dee6---65785066258.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce5958da23---dimalamidabaleka.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/53680135912.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/46324341721.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/39608936746.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/6k9msk1nmt2fan0l9a6kk0r237/zobawomapodifebib.pdfIn PDF document text
    • http://alkanboya.com/files/file///22953282582.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a855377d07f---ruvenegejajisamogumoza.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/e82ca30f1173337371d4e24ae406064d/43856911136.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ff30e6b04---nezif.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zofomonabadeduni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=ground+reference+twisted+pair+cablePDF 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_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 16804 bytes
SHA-256: d7d15dfbc709019a0ef70e2d717d3f062076657aa5208e7b6ffc52e25d52bbe0
font_01_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 10976 bytes
SHA-256: 40bac3c1e2dafe49f48dcf33699bf2f4c3e8d005b6cc5af05ae020fa6b68bb27
font_02_sfnt_off00012e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1