Malicious PDF — malware analysis report

Static analysis result for SHA-256 89d4cd72446200f2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-07 10:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdb66858e5d01c00d3418e46450068d9 SHA-1: ad48d21bce817a30d0bb27182b77fbd730a54144 SHA-256: 89d4cd72446200f221fa3bfe5e404083e1de5182eaf8c9cc75e02af178835c35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. While no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://ersatzmonitor.de/userfiles/file/dekexiseromenirisipozekov.pdf In PDF document text
    • http://vuonlan.vn/data/upload/files/43412413464.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/86266568350.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/99627436876.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/kazamejibogejozivowimo.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/salemabamamimubidugidib.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9645f92b10---tutizikexozatafos.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778eb42a782---31135442921.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/nixaguzejiriwasokikiluto.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bc3f9f9e9---borawuw.pdfIn PDF document text
    • https://ebooksweb.net/files/file/28753093474.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/32493243696.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/xilatixibepufevog.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44672c29c---33918083166.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/63373487954.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/bogowufivef.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/nvbqnqr90u0qbu76jipjt47q5o/zegijisevavasanamuzus.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0a89ad934a2f1f381897e71326b4b612/90289922186.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zelukipomiziledajonofuvo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/56428926336.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0300009a5---xitudegupubigepupak.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b63a14c81---mosara.pdfIn PDF document text
    • http://shamayachts.com/upload/file/zurivekala.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/7540506903.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/48289262260.pdfIn PDF document text
    • http://nemochem.cn/upload/files/fesijukorutapa.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e8e2a3631db47d139d19a01c4c8d67b2/nekejoberijofu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/maxavijamol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=erosion+and+sediment+control+manual+fdotPDF 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_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 17752 bytes
SHA-256: 2ac3ea203c9836fd9e9398aaa12334b2f90631faa31089cd8516d7349dd8206e
font_01_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 10720 bytes
SHA-256: f71a1858653cd2db61a5671fc2edd8013b58454a3496c301ed5bace4c1856b4a
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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