Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b9ee5d6b126461…

MALICIOUS

PDF

90.2 KB Created: 2021-09-18 01:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca569c9d793eeb5106440271b3da4074 SHA-1: 32b98979ce527b84f44fb1667745d03df8da3911 SHA-256: 51b9ee5d6b1264619640438f0f1d6af11774cb3cda6ff0bc25ce26da0e170db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery through these links. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://medvor.ru/uplcv?utm_term=my+money+android PDF link annotation
    • http://galerie45.com/userfiles/file/tamepureranimizugigoturig.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/zikaw.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/12777105855.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161375fed93918---bidokelikumo.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/25796879637.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/25012416527.pdfIn PDF document text
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/kekasujijiz.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/66396232204.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/77834065542.pdfIn PDF document text
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/kazajofewobixexibazida.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/54225732907.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210901_B1B5299BD52AFEEE.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/sewozegozuperapegemezi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/pegubexeda.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210909_6036C0D5DFEB6ABC.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/wobagefiwujibulutuxovom.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/83308499717.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/27649202721.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/42330898296.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/41740815739.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/49234104531.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161434c9b30e00---marededalakel.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/tisinukexugesetikamon.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/rejam.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0794b3f9---23927518646.pdfIn PDF document text
    • https://12shio3.com/contents/files/lomujitoxelal.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_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 18520 bytes
SHA-256: 6d9b5d71484161b1a5c848376a53223b86b073b123c6a2af9987f408b35548e3
font_01_sfnt_off00012ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 10204 bytes
SHA-256: 0e9dbb4170964f4633eb3b3dc7e25a5d238244a8ac1c0789dcaff053e4233534
font_02_sfnt_off00014397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.