Malicious PDF — malware analysis report

Static analysis result for SHA-256 828abf41e2448b76…

MALICIOUS

PDF

74.8 KB Created: 2021-09-24 06:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 496ed753bdca1756e3fc5c362a34c588 SHA-1: 6426919b587c94c807f44b67ae387f7df6ab6eb3 SHA-256: 828abf41e2448b7625ca5eb7928fd3c4925b65994dbdd8678bb3cb23c26580f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to potentially compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of embedded JavaScript further supports malicious intent, likely to facilitate redirection or exploit vulnerabilities. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zabbeleecooking.com/ckfinder/userfiles/files/jikuvofabakiparupo.pdf In PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-17/20210917100006782364.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/97525706224.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/57638131322.pdfIn PDF document text
    • http://jljemc.com/upload/files/98587739428.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/rimizimi.pdfIn PDF document text
    • https://e-midas.ro/files/file/bulemomezirixaginisonono.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/kuseberabexigitinile.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/xopojaxirotogizikatufepi.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/jexupowo.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/kulawuvizajajanuwige.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/kuxurufinidaferelovirumit.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/42929617031.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/17005528213.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/xerafenojejek.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d7rjld5asgvtvn5j91874rsdu6/66282618939.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8cbf80ead6c652d3fa31b94dc5c82f5d/90091189724.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d923348ab1fe1f1e10be561c0e63f74b/76078203307.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/800641849.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/libajurawixo.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/rutodurujefumarepusudime.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/30650558977.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/53995313064.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/27613065128.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=animated+movies+download+websitePDF 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_off0000c117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC117 17032 bytes
SHA-256: 867fb90ae592310cc2c32fd9b014c55734c7bb1b96d8aeb3e5a0632b6ecf1b9c
font_01_sfnt_off0000ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 10584 bytes
SHA-256: f1f251f274deda38ecc66a7ac0f29dbfc2eb8480c05024cdbd42636b746209bf
font_02_sfnt_off0001055b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1