Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede3f3e242a1e2cf…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 09:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f056e4474def1012189719d1ba72a24 SHA-1: f5ad52c8cf1560078c8152348ce20c65cd9eeccb SHA-256: ede3f3e242a1e2cf1ece27ba480dbb3d5fa6f7e18a14294a0f612e31104d9070
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection or phishing. No scripts were extracted, and the document body was unreadable, so the primary indicators are the URL patterns and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://veewood.com/file_media/file_image/file/ravamipipuzomavom.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161370ab8c1d7e---28818405468.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/katelas.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/72241643667.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/11277784044.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/29003217350.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/44482572871.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/97241519176.pdfIn PDF document text
    • http://zzquansu.cn/d/files/libejife.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/90885340999.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345beb3f8f6---vubenuwigaxenutat.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b96c270f---mudaxorebenotiro.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/3a9dd50af7da126d6dcbc7523a045ecf/34649461085.pdfIn PDF document text
    • http://dhf-china.com/d/files/zoxafemoserusaluwe.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogolo.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/70178996424.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9a58b9d1---derizigezededa.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210906_3DA2B1E5A2EF46AA.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/fifuvolafe.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/12624197264.pdfIn PDF document text
    • http://phutungotodungha.com/img/files/pijovijuborudukan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+most+popular+skin+in+fortnitePDF 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_off0000af7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 10780 bytes
SHA-256: 51d7d0e9dd503e2d2994c275a7c42c000eb28d5846443d2dee1ff3afc5861457
font_01_sfnt_off0000c81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81E 15816 bytes
SHA-256: 56da74a90877aa5dd8846f4518fcdaedc6c9138da4c701c7b52c54983f40ef19
font_02_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1