Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe809471c9a6166…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 21:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31966b19ec04ee1474fce70c85e4f4a7 SHA-1: 1358d7d5870bf1c95bf775cd737ead5011ac5aa9 SHA-256: cbe809471c9a6166ea4b9a8f0dc69626fcbcf13c6b60e2d5465a2f416876310f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The file's structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=que+es+socialismo+utopico+pdf PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/tihi0c1fdtgtfnu1vaoacvtp9t/33083815190.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/saxazuvujilavakobenuw.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/10529090666.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/33727333865.pdfIn PDF document text
    • http://agavietnam.com/img/files/tigutoxop.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/tenusawerukarewoze.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/va3d6ud57vf28r43k6fkvv73c4/59202814725.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/guduparif.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/53173378168.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/91080429189.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/43757392213.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/nugowu.pdfIn PDF document text
    • http://mutitar.com/user_img/files/motewobefalizexopaz.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/werovasupesusotelunes.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/5208653023.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/vikateloxoragosifejam.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d72a363302---lanosuwijomil.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/39166390760.pdfIn PDF document text
    • https://kede.org/userfiles/file/74400832532.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e42f91c3a5a---35212805644.pdfIn PDF document text
    • http://foxadv.net/file/nifim.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117afe69b4a6---xeraxasizato.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48c60d5c6---fawajolegimukifareviroluf.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/4a635a9250b05ddb11dfce4fe56c9459/61047242535.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10736 bytes
SHA-256: d9a88453b69f4b95d3ef7ed41cb33e4ff432a5dadd77b7aa16efd390c10f74dd
font_02_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 19696 bytes
SHA-256: c733ee7a947428e5ad94cd9d660ab34c73ab3e464478b14f3b019ec66167e0ca

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