Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdba9403da89beb2…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 07:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf6dbb79f1324f0db23cc9b364f9470b SHA-1: 64fcb584af40bbef514af919ddfb3d26ca6a28dd SHA-256: bdba9403da89beb2ad450076e91b1dfcc41e019815afa748a87ce2829f2bfc23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also functions as a link farm, directing users to numerous external URLs hosted on various domains, some of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=fast+and+furious+hobbs+and+shaw+movierulz PDF link annotation
    • https://tenfci.org/userfiles/file/99586917346.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/rutelopedojizar.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3sli6c66t14ljkf5dc57stgqvj/rimadapapivumo.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/polibe.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f5bf56f3b---33908734269.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614df28e1756f---pebifetepora.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/74578282394.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/zuvebaduwixo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac8c0de999---7347842781.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/zurafuxilizitefugidaxibex.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/pikejosoxeremuduwojob.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/83457415792.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/26584666209.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/nobavulawatazuka.pdfIn PDF document text
    • http://katela.net/userData/board/file/gilalaxorobugozelesu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/nedalikubexisifibi.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/90879153260.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/13692289215.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/78854512588.pdfIn PDF document text
    • https://petala.gr/userfiles/file/gubovadusuga.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/94886153322.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/zapexejafiwabigimigeza.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebce0eefe---95582849297.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_off0000b31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB31 15860 bytes
SHA-256: 77d746c232b063599331129d6ad5b3e6cf96a54f5a46d5c6ce139dc174f17bcd
font_02_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 11048 bytes
SHA-256: b62e73838acba0e5a677ca8fe1a89c2f4ed7165f1efff6a6bd3de0145071367f

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