Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ced9ed16f2e161…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 00:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6aa562e4022cc39f67c2c681be7a33a SHA-1: 2f38671364c1d935c1667263cad8791172bd198a SHA-256: e4ced9ed16f2e161fe618bedd04477223cfa4d264047f53c8ac713136e17209f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, serving as a lure for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=tribology+of+abrasive+machining+processes+pdf PDF link annotation
    • https://slezanie.eu/userfiles/file/wulokonewuloluke.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/bifejukafamileriw.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/24617be66df71d4b28fe5bb2ded60ee0/nadeforudetaxi.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/tosuwutalijufiwaguke.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a491f9c34cd---45911149531.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lrtc42msggpef7e1en8fg4m2m4/16276114846.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/290f474acd140d653e9ec717b28c073b/fapowefakagore.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/rinoloxegufavozubaraxu.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/cf439e81277f46d7bb494f9da62b7d59/jotuvogisutilububud.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/10646537225.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/livozolakemeruwidejamas.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/fo3gt7aqme2tb4o84o0shr3t7p/zulamir.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f49f5dc6f9---54693672507.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5d1604484---ratanexapaj.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///mesuzipu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a5f9ea716---6735791361.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/rarixazobutusat.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a53a9f7f87f---gidagebalobapizokafisok.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612022a8bfeba---depasusoxutenikapanejef.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/lisebadojeboduginabalasi.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/56034010582.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ponuru.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/3eed5828ad3278e53e4fef3999f9dc1d/foperunuzo.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/25510182973.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_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 18832 bytes
SHA-256: 82d6839c64bff58ee08206e798fded4fe8729954dd20507229c33926a1a9cfb8
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 11252 bytes
SHA-256: 4080414859f00aef88369ef52b41e191a1ae532c0e90e8328d1355a1e4225a53
font_02_sfnt_off00012d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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