Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdbd78aae89e3710…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 01:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 862f4cedeb798f378e26f57e657236b5 SHA-1: 813e7c8e6a43618b8c881aabb3f3fd093261f5b3 SHA-256: cdbd78aae89e3710806e093c2fa394bc5580905165115cb22866849027db332f
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest an intent to redirect users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://bagodilovaspark.hu/userfiles/file/binabeguzidixomomapu.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b204f9c3f3---54672746805.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/fifezigiligevabivixojuka.pdfIn PDF document text
    • https://ferropula.hr/files/vagitexemugukejujewif.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/nitutolar.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/mimunusotalifa.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/76065221347.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/nogesotijasosarisugu.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/zabili.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/somapekeli.pdfIn PDF document text
    • http://neuroxl.com/images/file/ziniwonalat.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/sonuwoli.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/40211941621.pdfIn PDF document text
    • http://zzquansu.cn/d/files/jukegejegakixole.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/zoripit.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/tapejakomufejipakor.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e5356746a---83907347912.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/sijiru.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/xoxidatasojene.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/52daa6423410b216049710ff6db16994/vikafakosagenororowelav.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5344de785c8c42a8e19feb5eac066f93/24334785773.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/79815288243.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/61044134321.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/guselexupawefitelijowiba.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/31906862371.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/72658818434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ps2+emulator+gold+apkPDF 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_off0000c430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC430 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 16896 bytes
SHA-256: 6cfbb22e00d4d4d5cd6b1789ae89d527e45aa45a1c1389406beceb8cabca3461
font_02_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10852 bytes
SHA-256: 5695bf24ab9e24418d621e6e56c704bc1aa0067a4b6a9e8f242adfa6c617d3a9

Open this report in the interactive analyzer, or submit your own file for analysis.