Malicious PDF — malware analysis report

Static analysis result for SHA-256 60ed80e60014cec5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-30 10:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4c04604a1489a4e89c910b6157c82b70 SHA-1: f89ed0ae5c494118aebf19f3d1c02e13f1129694 SHA-256: 60ed80e60014cec5517fc7e2eaf345245da21c67925bf05fe491f1716682fd2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier 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 0.9973

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://synerhu.ru/uplcv?utm_term=in+the+time+of+the+butterflies+full+movie PDF link annotation
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9e8c751266bc8a9a379579f741166346/18310334775.pdfIn PDF document text
    • http://haki.vn/uploads/files/72213368692.pdfIn PDF document text
    • http://nemochem.cn/upload/files/gujovefutebipatel.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b8bc28a305.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6c0efd69---24830103005.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146516c8fb7a---gimozaregabosiwifurul.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/dosujupebewusafejod.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614af653cd311---zadovigav.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/54416937942.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/56066246681.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9ba5cbce9---mugavenegupan.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146baf8d7963---rudozibazem.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/70378290021.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/komonudo.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/87550484796.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/kasadewixegatorixok.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/96777308785.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/1714116719.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/nidifoxinenofur.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/49379290944.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ecb2b066e179096ffafd0005a3d311be/juwuw.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109250026525088.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/zonugoxezojopokezo.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/37478436429.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_off0000b763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB763 17244 bytes
SHA-256: 86c4714730ab1b76bbb27e5627c2501ce1e83bd4bb35db8ea4ee9a4d9c261b37
font_01_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10572 bytes
SHA-256: bc659aeee43ddbd3ea49ce3d1b0951107f9a8a7b79442947155f93f438cde129
font_02_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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