Malicious PDF — malware analysis report

Static analysis result for SHA-256 568dc58ac96c9afb…

MALICIOUS

PDF

91.5 KB Created: 2021-08-24 18:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 798556c833612ebab02cbc663e14f0ba SHA-1: a403cbd9b5e613f6f4ba82b431249df9d6733a36 SHA-256: 568dc58ac96c9afbf3814965b3a95223b406f4aead40cf22ef8e898b80433aeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the ultimate destination, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • 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://lecachet.fr/docs/files/napudupikile.pdf In PDF document text
    • https://pharma-tools.eu/galeria/file/pepuxowufilonon.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5f1f044b3feae474df50103e2a5017dd/72814685156.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/58327348778.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/60311630704.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/61887023928.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/16d3a05af21b32d431225f94be9ee479/xotetutegavedanoxuzuf.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/733480681.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/gorejiletal.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/23585880845.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84048582238.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/sovosilazawizomagif.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e643c335e---sowujoti.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b42bf94---rijexaremeromupolujisux.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/42993834505.pdfIn PDF document text
    • http://coniperfumes.cl/js/ckfinder/userfiles/files/72591308021.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/kowulirenikepuf.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/9878274518.pdfIn PDF document text
    • https://proia.bg/userfiles/file/bidekugug.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/18888962424.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/14065236272.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/pubilatis.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///600114330.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753ad8b8f30---73654828979.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/205a571481163ddba27841663cf4cddc/80595708460.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/nufesafomoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rice+growing+timePDF 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_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 28992 bytes
SHA-256: 7e49ece1210c7b3e1e7d778ec5b2d0a2b0407e4005a785d8eb77010e6aa05594
font_01_sfnt_off00013035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13035 10328 bytes
SHA-256: 632693df66ff20d5a8dad3c6b046b75aa5f9f89b75f3bd8ca90c1365b1f47c62
font_02_sfnt_off00014788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14788 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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