Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5e43ece3d09c6b6…

MALICIOUS

PDF

89.1 KB Created: 2021-09-07 09:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f34ff91a10c65c9cc8c5f432be30d8bc SHA-1: 80ebd1ad25d5792cdeb22be568330c2b0ce31bdf SHA-256: f5e43ece3d09c6b608c10953ecce9e0592407ced7b7dcef48710addfed9f6437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's designed as a link farm to distribute malicious content or phish users. The presence of embedded JavaScript further supports malicious intent, likely to facilitate exploitation or redirection. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://infrive.ru/uplcv?utm_term=oxfordshire+stroke+classification+pdf PDF link annotation
    • https://xigmatek.com/upload/files/gofopizekixafodo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/patine.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160990bc1b17bb---65218018392.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810d42adf71---jibixuwuwinoki.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd6ade9634---42321994971.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16112c85975df5---83283550584.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612079a679dc5---67153286873.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/5026856620.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1afb0d29f---vivinu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a49bc760eb---xutudimajamotale.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/zakufepapakirujifitag.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/jezipinipo.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84c8ae781---jopade.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/bfee567fe70a4a3609dc2e8108721ea5/85445545110.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/63577842118.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161085bc9cc734---19521530512.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/95709352662.pdfIn PDF document text
    • http://sentai.cc/data/file/20210814_201722_505.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/48f21e2e0173c0f697783a812994b30f/65273513664.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/66688261659.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160da618017cd8---74820018736.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b76f2bc7---rurufafevetekowufuziwuv.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/gozanitadefowowazebolid.pdfIn PDF document text
    • http://boldogelet.hu/media/14103589090.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wajerokobexibubefimaru.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/836aa5842a042df233c62849e13c20c9/vabikopuzaj.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/931d0dbfed53231dfb6d512cf169d283/vijogaka.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_off0000f41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2E 18876 bytes
SHA-256: 5cdeecb412b8ec1149f5c9bd84e8bcef87dae723ce6b432d08902c76c08dcfb1
font_02_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 10936 bytes
SHA-256: 15e26ffacb78ff94c594b2da2814ef9994b8622658c737bc41acb1c8c2827b50

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