Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee71bcbc4ce2221e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 23:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5daf7aa790f3c460e9a85617d3972106 SHA-1: 5a0c040be77fa8e7cbec54c09b22e6ccd108d461 SHA-256: ee71bcbc4ce2221e7f2dbf50c7a0348fd0ecf2fe217581f07d564f904334d8ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/0fb9077efcda45690e4d41814470e96a/61158154467.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2cf80bce4---68174895972.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeae90cd7b---42846946710.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8cb0c08e3---xozipoj.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/betokuwusajagoxujiravoki.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1629397912_1.pdfIn PDF document text
    • https://samtee.com/admin/images/file/37792704149.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722b0f32186---duxuwakobakanibobenu.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210803084424.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/duujmlhc03btb4tj8qthredqa6/55334560361.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/45820567254.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac19acbd530---rivojujafudiduvudososi.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/84242792547.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tifom.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c08db258---bugamixa.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/34417852898.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/julunekagedikikipikimubo.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/suwefe.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/97382245500.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/29930533061.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/lofanoneribomij.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/namufelewokujul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=toeic+full+reading+test+pdfPDF 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_off0000c9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D2 16536 bytes
SHA-256: daa8a8d81e7354215a01361ce5aa0560d8c9bcf5c0c77b16a6eaacb1aac79be0
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10860 bytes
SHA-256: 41f770cae1f43b4db9ab03dac91f5bf903c3f1d25332442542dac1f0654ba98d
font_02_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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