Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3d568f6582e8fc0…

MALICIOUS

PDF

87.9 KB Created: 2021-08-08 06:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bf552b1f64531fb7783901a21970487 SHA-1: f8f47368d7a113b0d5d54616d3f0ed170149f59a SHA-256: b3d568f6582e8fc0c390dc55e52816fe623fbde049770927c0cebda25e15c90a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. Static analysis revealed it functions as a link farm, containing numerous embedded URLs pointing to external sites. Several of these URLs are hosted on compromised CMS uploads or disposable domains, indicating a likely intent to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://efuturesthai.com/uploads/files/95922253290.pdf In PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/gazalizuvodaxodusu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b4c3d9c62bd788c69a0a3c4dbc9cc278/ruzafidodedadoroxenolol.pdfIn PDF document text
    • http://waypl.pl/upload/File/66737405553.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/lujotaxelekeb.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/37747788eb4777bac18708db433fd1f1/bixorepejetisapamutu.pdfIn PDF document text
    • http://mebco.ru/images/file/tedefezesapolixizu.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/42284614711.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073571e00a77---pilakerefolixigegefoz.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/zofitofekedulibotuseva.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/af9abd05dbc3cae5447109993fae155e/nadurafasarasutupimutejag.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/29860855845.pdfIn PDF document text
    • http://nessium.net/userfiles/file/zuvapelaw.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/78984882322.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/sojixafesojiselikidaxixat.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/dujeku.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210805151352.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fd6148a888f---92295469189.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/4e367cdbbee9c5a49ea7fa721807dabd/49577682341.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/vobux.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/18315173848.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/bilebuletezowijimadumef.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/zusenexelagemem.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/5e8367bbf6ccaa8a4feab068fc26a13c/47179875394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+5+branches+of+oceanographyPDF 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_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 11004 bytes
SHA-256: 5db4e34bd3c25dd63c7d8ff2af929b43c31260694a2b09f38398a81b79f3c313
font_02_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 17960 bytes
SHA-256: b544177a53920e64f37a5d406403e7b1002330ce3e95d1ae4332d375b8787811