Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89b25b0e638f610…

MALICIOUS

PDF

84.9 KB Created: 2021-06-29 15:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 328d1099ef3d3432ed794077f193376d SHA-1: dfdc01e586de53a26b78ba05aef2ae7576900b0a SHA-256: c89b25b0e638f61069472a464c3ae7e764944f64514e1def95ee5129615c7356
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://golf-tout-terrain.com/publish/page/file/jugunekukusatibep.pdf In PDF document text
    • http://brandnewgoods.net/userfiles/file/gogaxowifojuxerinukan.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/pobikotopinijarus.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/5ohl76889qiusoc3ners4s6co0/47338529621.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/rifijarotujupi.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dipafajinotagesi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/92b49b97165779bd44bf91d29adfc1d6/pebumube.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160799c940fc2c---25854944407.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/kupusome.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/e808922c75f2a6784438915c818c3069/vovujitatidoviwakixomutu.pdfIn PDF document text
    • http://greenbrier101.com/userimages/vunezavezi.pdfIn PDF document text
    • https://signika.pl/Upload/file/biratojojademezemunogele.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e7b1a9b79---bujojelozozunazobe.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/dedejamulodujapakepo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c5190386aaa---gedutewab.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160866d48b0121---82020693075.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b64d7d351fa---zigalagodopigixaseve.pdfIn PDF document text
    • http://rhondachem.com/d/files/benigipuletikoluxewuz.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/tegabojitetanasotesoguja.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/bosun.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608acbec6ad4d---kemibanetoteluxul.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5r1cs1gh9b0gt6q7l7hl0ap494/66030271155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=php+to+pdf+online+freePDF 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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10353 16936 bytes
SHA-256: 3fc108a8c6047334090b5ba9d40d1e93c66138fc1bb4b83545c1c0b05e8224fd
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 10268 bytes
SHA-256: ca6b762b8e6063ec7695499585f4504a5e3f7337bccaf2f0c1b5473489fc9191