Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fdc96f30879e940…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 01:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42b69cdbeb861e8c0cf6e0d5eb6c751a SHA-1: fb732c4a7a7f55755b977c28c9052d40bcbfe569 SHA-256: 9fdc96f30879e94024c4e2ee49b34cd39b7b49b1a4171f6f457d8a36e6438fc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or redirection scheme. The presence of a 'utm_term' parameter in one of the URLs further supports the idea of tracking user interactions for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/mifumupovosaxedujibo.pdf In PDF document text
    • http://giadinhmedia.com/uploads/files/68735510460.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/jodaxunasapakirira.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/mimoxejemiguzowafewasav.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/kewabene.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/stfupujuj4mbqbcnlnror4pj5e/2794618637.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/luzuziberorarega.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/6492324457.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/195130673.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/jurukamimikutomebaba.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/20878033821.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/tibof.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/47776812849.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/73519300369.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b2aaab870f56820e48ed31682a3ec586/vuzimu.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/kekekililukusogamituwe.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/29919568569.pdfIn PDF document text
    • http://turnyras.lt/Files/file/55937844716.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145d1651c9b5---50168232924.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/53186133046.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/bogesebameteze.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/70025148889.pdfIn PDF document text
    • http://househouse.it/userfiles/files/59812208964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=365+login+email+loginPDF 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_off0000dbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 18544 bytes
SHA-256: e81446709432564be624b921b833a049730761deb07fd1d12d9cee1f53388e86
font_02_sfnt_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 10460 bytes
SHA-256: ab000fc3a91866fee81de25e3ac262ca94be2234e7ecf4dbdb303ebcfae818f0