Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae505498989cb63…

MALICIOUS

PDF

90.4 KB Created: 2021-07-01 21:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bff05f17b612b4900ca4842c516c492d SHA-1: e11800104e7b3387863a751f7da1da53b9a52a53 SHA-256: 8ae505498989cb633180dca7784a8b1bfb36906f0abe4d5769aa06ddfbb8424c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be distributing further payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/0e82784fe03ff982b049369dca8d8c1a/lokafaroforawigabik.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098968c7b1c6---43545467003.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/e5c52be2c605f9b470d215101aa54ebb/25734418540.pdf
    • http://bilmatbasim.com/userfiles/file/luzasufobupefonukedovejis.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/fa5e38823efd664d19b22ee2ce996c14/perizasijexopodolanamo.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/36cff3b3ef17db4dbde5c191df4b050e/vajimidukag.pdf
    • http://alnoorcity.com/userfiles/file/92938236144.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/4dddf279d8989be31bd1a25170c347f9/josiwobofidod.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec46bf709---59690771947.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd41e47c9fe---63731089282.pdf
    • http://a-kamen.com/userfiles/file/vobap.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b1ba41f0f---17989073792.pdf
    • https://yildizwebpaket.com/calisma2/files/uploads/56934958727.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c6e62afb8---jofevedewosupexavez.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/m9pdko04fq686at93r70koa532/bedolijija.pdf
    • http://weddingdiy.cc/uploadfiles/files/20210606_033451_2699.pdf
    • http://activesolutionelectric.com/images/file/vesatifaru.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d62d64649---kepodowewofutetum.pdf
    • http://ztkammer.at/uploads/file/vivum.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43c4205dfcfd6f107a0fd09bd48e0c15/nebobivudepusakaletazilis.pdf
    • http://www.jacenter.org/js/ckfinder/userfiles/files/rezoxivobevajofepod.pdf
    • http://begemot-rus.com/uploadfiles/file/2021060806083773499.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/xotemaguge.pdf
    • http://munsusa.org/userfiles/file/20210605105423.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+make+a+gold+nugget+in+minecraft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff2b.bin
5d2519d733be7d8e33fadbd4c8c9a65bac47825b94bf77c566a066a4cfec156e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10920 bytes
font_01_sfnt_off0001183a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1183A 16792 bytes
font_02_sfnt_off0001304c.bin
63ff4874f32f2b0721c32e42e63ef2694256ccf56623cd84d63d463a0c654bb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1304C 16832 bytes