Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead6ed19599a4969…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 02:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29754e70f8e37e8db89889550cd4bc1d SHA-1: 922f347e5b00fbbbe415b1b357169485c875df98 SHA-256: ead6ed19599a4969522716199a565a7e4659ad5fb366b4ec13e0d9a8b2f91c85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as lures to direct users to phishing sites or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=pokemon+black+and+white+download+for+android PDF link annotation
    • https://zhansq.cn/upload/file/dibezutenonofotadetuba.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381278d94d---74902525640.pdfIn PDF document text
    • https://www.ocnistudio.cz/ckfinder/userfiles/files/89627119547.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xemulej.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/mewoliwenijitete.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/walexowozojer.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902091246.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e352553497---wenibeg.pdfIn PDF document text
    • http://soupworld.de/upload/file/pakadapufan.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/48g6tur7bcg2me09udsufbgco6/kusipifijugolotigibibibij.pdfIn PDF document text
    • http://szerecsen.hu/editor_up/vobibotute.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2568785b---patedapetetalepovososajeb.pdfIn PDF document text
    • http://soles2walk.cz/data/file/89373796899.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/70227770441.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/33021055016.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/20965340040.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/zabegopexoranakemupo.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/xelijebufowabon.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/ritage.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/59317105709.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/91792121104.pdfIn PDF document text
    • http://telektrans.hu/editor_up/26787413264.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pudawoz.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/boxopefepakexujonaju.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_off0000d80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 17852 bytes
SHA-256: a0fe40bd811ee6789281a7f1e62b0fba3e6f3e655312274b1ccdfda13bb5c9e4
font_02_sfnt_off00011e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8D 10892 bytes
SHA-256: 7d694bf15426d6daa19206754d52dd03682cd9c649c36272f38525885bd34e0c

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