Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f90c2a109608d41…

MALICIOUS

PDF

85.4 KB Created: 2021-08-18 02:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: 6c41c33810e96ec4839191c19f5c1911 SHA-1: 555e28a736b21e499cdd587db4d1ef5b6eb3d895 SHA-256: 4f90c2a109608d414d512ae5fcf7a114b9024c395f74da694750d3e2d47104c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://www.grdr.org/paidel/ckfinder/userfiles/files/duxafefap.pdf In PDF document text
    • https://hzautomatisering.nl/userfiles/file/99095292637.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/tikewevinexoluzupejel.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9e07bf96efc5c184e4c321e4a22ed111/34624493831.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b6975f63f683864e81ac23b1eeb076c2/55818567375.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18396445362.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a627a564eb---84058457068.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/tafitigarozujuzibipab.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/ffb55177742c2a8de313d231f11c4287/zewizunusitevogepejo.pdfIn PDF document text
    • http://krzeptowski.pl/file/xerutagatonifarukobin.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/40889147953.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/ganekijibazixatexoluvewem.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b764fc29aee---tivesufo.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/dafiju.pdfIn PDF document text
    • https://argumentua.com/i/file/72709225982.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/8986078644.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f703666f1d---53754538332.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/livabo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/558705ab942f5b72946c2843c42bfa2a/13566371292.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/66403407804.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/pabobeduxifara.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/6035806931.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/18417710517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=les+enqu%C3%AAtes+de+l%27inspecteur+lafouine+cp+ce1+pdfPDF 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_off0000e3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 18800 bytes
SHA-256: 68a4dc5d0e2e9539ad8a9b9dd303a92ad42dd8a199ef4f4e969b235bb469492f
font_02_sfnt_off00012b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B02 11060 bytes
SHA-256: d03350d0b1b1cbb8f70c78c2520021605e1e6a6da8826bd194d9f1e3bf8a3bfc

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