Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb007ce5390e464…

MALICIOUS

PDF

86.9 KB Created: 2021-09-16 18:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f65162be4ff58f6475df960ea3220435 SHA-1: 19820b11ff182425286009ced9dfc1868f4320e7 SHA-256: 5bb007ce5390e4645f25e47e957bf47f9a1e42258df7feb6c26aa929d6d279b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://eastwoodfamily.net/userimages/42898817293.pdf In PDF document text
    • https://mokshadhamnepal.org/userfiles/files/22124189594.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/45287336196.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8317ef1f---58323969789.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/nutire.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/50970198233.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/zigimow.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/movofezonuxisosepa.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/32531584296.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/50680800638.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/71417504794.pdfIn PDF document text
    • http://zgic.ru/!upload/files/nirafawimevimeponu.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pizaremarezuzoluketupuveg.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912102607.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f1d3321e12f03a4559c0f250e43a1a18/50430531998.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/wuwuwegofovoripi.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7tgik3khi9acchjrpo3tftk93l/83512926569.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/narasev.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/jalawexonamujumi.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/29893975139.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/4926682622.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/92300203550.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/kefoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fast+file+transfer+between+android+phonesPDF 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_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 17152 bytes
SHA-256: 519514a1b0dfea5339bac62b094f429c6772bc4881999078e9386dda43680cb9
font_01_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 10800 bytes
SHA-256: 22791102e599d04674c3a8624284b104cf7d5a6dde29c8c63d75d0dfbf0bb87b
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1