Malicious PDF — malware analysis report

Static analysis result for SHA-256 96243cce5d940ad1…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 23:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fef038892d4762ec2a826c29eea05147 SHA-1: 7da1c25c81861986c813fce24d34f1444550159a SHA-256: 96243cce5d940ad1352a6c9c132721e0f56efa18aea3d575d17c297c43b00280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests an attempt to track user clicks, common in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=pokemon+light+platinum+master+ball PDF link annotation
    • https://pindimana.in/uploads/file/zadenarirezarajugu.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/tuvuxotejobafoxuv.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xedijuwujuleduzexo.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/zoxiwiwudifomasaj.pdfIn PDF document text
    • http://ruihuitax.com/files/file/lefovipewob.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/fafoposepurer.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/dupuzudamalijefugonojoxuj.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9280035037663ed7242495ca8fe16c31/87525538509.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/lokukegopurazasifotava.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/91862809756.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/61474581779.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/78636500111.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/21467750893.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4e1469c11545ee5bb0493b0ab566cb45/gumamurejojuleju.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/nezoxeraxekavabubijosad.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/cfa79d4fca81a70f818ec53d8017d4f8/97557250385.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/mefexaropadijesesu.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa561cbda5---48430239181.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/71841070111.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210905050113.pdfIn PDF document text
    • https://bursac.net/userfiles/file/38774231161.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/lagupamewogaserububepivuw.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/kanavisabenezonajelonufow.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/jewusuze.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/88862806747.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_off0000b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 16352 bytes
SHA-256: 822b1e8e624f1331363947304d7d1a224048d2cdad7f2fe28db851b434fb9195
font_01_sfnt_off0000dba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 11032 bytes
SHA-256: 2d95dba19b178f71fe30f5875d82023e1b8828ca9e88058fb5884eb3da87518d

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