Malicious PDF — malware analysis report

Static analysis result for SHA-256 480ff33260d48b0f…

MALICIOUS

PDF

76.4 KB Created: 2021-09-24 06:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ee378379c2766a897e9dc669125d03d6 SHA-1: eb584e2b9c925ed348f6c502bbca6a6ccf2009d0 SHA-256: 480ff33260d48b0fd7b5ce5fe8319950fd0034e3c70d3132a524c24352e45416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=android+studio+tutorial+pdf+free+download PDF link annotation
    • http://sk-uralstroy.ru/uploads/files/rigotitewedaxo.pdfIn PDF document text
    • https://stauber.lt/images/files/wafafokuvogovumizo.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/27596832191.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbc804de3c---51299789010.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/35990156557.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/6878184488.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/xotamatajosop.pdfIn PDF document text
    • http://thedreams.cz/files/20770283865.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wejufawikusisiri.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/bavowetewefadonesaxi.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17030996021.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/deniguvedetomorovake.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/saripopafob.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/tokixigekulok.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cbe918608---vejosukapunal.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/77343353343.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/gujafekitalikip.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/86dh4mftapf26lo4ckhv77vvth/jivadugikozenuguwegud.pdfIn PDF document text
    • http://qigong.ru/userfiles/file/23029127388.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141e24690632---74342087156.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c53ee7f22---tapim.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/vegiwubudizomorabafonuj.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/98341734623.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/tesetedapowevitalotoj.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_off0000c737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC737 17020 bytes
SHA-256: 4a3e3c67f7ecd94227123b349e1ce6a4bec059f435efb69abc11a2a86e99f697
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10656 bytes
SHA-256: 064a0b67be7e99e6908381c6844409ee97e2dd4457604c499a596d0429e099a7
font_02_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1