Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ffaa13fe5b06f7…

MALICIOUS

PDF

100.9 KB Created: 2021-08-27 18:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 71f209e3a676eeb9fc5c44190b5501e2 SHA-1: 5f15182481a20375722dc7619bc6ec4d55cc6c03 SHA-256: d5ffaa13fe5b06f7e3b4a8ee275aa5f29106ce4510dc7fadb6f0bc134daee03a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated, but the presence of embedded URLs and the link farm structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://888chji.com/userfiles/files/zuwimivo.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b91f7242b---zugibewiwanopumudawir.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104f33aa1187---82261305297.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ecaacca3---natezopafogafigafewe.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202107052304291495.pdfIn PDF document text
    • http://mybed.tw/uploads//files/202108050719423424.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/bugifetiz.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/37032955151.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/fejiwiberefifenal.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/7eec9fc3c7f02b86d6ef6ad1ed4fee75/waterasexubujekutidus.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fpk4v67sa4s0sccbfprn2j86s5/bezuvedimilowafenapuvu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dq2amiobe80ricftmbanpoqb4k/viwovizukudirokaguxu.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995d3a94b58---42622839922.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/rapepabanate.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/90355034536.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ba7ff74f6f03598aa290186dd9bd3000/91229796138.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a8de3b392---11282073246.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3a76a9d614a232dbd022d25232c91677/xezewudaroduratazugi.pdfIn PDF document text
    • https://aashianarealty.com/file/42021382562.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/domumonilakatuxawilefoka.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/69697407561.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/99542172181.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/buzuwukilenedefi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/zesag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+juggler+meaningPDF 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_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 19576 bytes
SHA-256: a9dfe0295890704db619bf6f7b5fde5c298cb6aa27bc4b8a9fade838bde73bfa
font_01_sfnt_off000154bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD6 10364 bytes
SHA-256: f6280ace816d08eaef739f8d509dc908ba4795a74cd8c0bf20a623e900d443d4