Malicious PDF — malware analysis report

Static analysis result for SHA-256 59710049d4301a6c…

MALICIOUS

PDF

129.0 KB Created: 2021-08-10 01:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 597aef61c9293661d52ed4e854a50686 SHA-1: a53f3878083df963a622d18292984f63c5089479 SHA-256: 59710049d4301a6c9d980ffa093c2912692d0d8130787a05f1ab11162b8a1a1d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, many of which host further PDF files. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution scheme. The document likely attempts to trick users into downloading a malicious payload by presenting itself as a legitimate file recovery tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b803d4d3a02---13018663147.pdf In PDF document text
    • http://sushinamu.com/uploads/files/jugidenovowirisunexujekus.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/gazilivufojajaxabeligi.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/28174853587.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/8255449220.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xumamuxo.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/81232be5fcd3f6d1ed5684176f312f11/96462650754.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c7f52cfb2---39471621052.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/22966685277.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d933948b47f---zijonidebigufosavanupewo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946363db6e2---notezetobomaxog.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/k1q2tfd63hgffbc6l0oncacttb/gujulomaburefagibusofuje.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d275553cc0---fijubutapexulewewaliwud.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/debifabuvigemimovib.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/e73ace80f26bc6c844ad308e37e32956/92367363889.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a58b30c72acf82cccd774ecb7c2ccd3c/4298780195.pdfIn PDF document text
    • http://calhi1977.com/clients/879053/File/fibizawadipasimiko.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/60007614132.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d29c4e82804---10062841293.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160964de928a3f---10564442021.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/gatuwenunemireva.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608558e87060d---13735799902.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/49038958677.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e2983606133bd264cda96a2222d9ecd4/70090703700.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/718d74d853fa9b449accdb65b4cd6479/karududuboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=zip+file+recovery+android+apkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19083 18908 bytes
SHA-256: b3df0358f59048d4ec475d50cf6cceeccfa4a384cc56d636f539181b83a9dc17
font_01_sfnt_off0001c301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB18 10580 bytes
SHA-256: b64cd810569f0a1485c66aedbf86bc1bdbac6bd89bb7795323d0cb488f331271

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