Malicious PDF — malware analysis report

Static analysis result for SHA-256 711cb30448f51278…

MALICIOUS

PDF

93.7 KB Created: 2021-07-24 04:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74c56b6b838beefeb71606f5e541e369 SHA-1: 26feecdc116544371db4c5c194dc2348dbcba085 SHA-256: 711cb30448f51278a60b794936960a742ae37cd0e202a85895ad4cdbc09cac4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload via the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://studiobaliva.eu/userfiles/files/31295379697.pdf In PDF document text
    • https://marosme.ro/hirek/file/86337002783.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3650484bf---gotowuzesujelegumefofu.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/1629456642.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/popepojunineloke.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e106a54a2---57221794190.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/nofisibanebaxekoxudobegar.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/gijupinigivo.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/vimosexevifoxi.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/dutizoxedawuruxisenut.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf38d719a27---72682524750.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/gefivudomomisalowaki.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/govarezikomuxekasesimeto.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/mevoguburabizofobuvuvutaf.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/29346544416.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/giridukujew.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b893dc6aa1---vupudaki.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/fasimunopakamudex.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210718162656834781.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/21956028002.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/91b1d281570ad51ced9f2c604eee7a9e/gotosetowuta.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/c1lu12m2d0ugdos5o2v7n0rpe3/2187722690.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077650461aa4---tolibafasawifiremike.pdfIn PDF document text
    • http://sy-smile.com/upload/files/kokewoxufe.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/zebarivasesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=serial+para+activar+windows+server+2012+standard+evaluationPDF link annotation
    • 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_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 11128 bytes
SHA-256: 01b91a94cbb1da566885f93737521bc2a37afbc070cda02f52f1cc72ed8dd4d7
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13787 17896 bytes
SHA-256: 1452ec41d573120d8c3c668a0a49cf91ec735df98d0458ea11c22bafcf60d052

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