Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2885cef277f937f…

MALICIOUS

PDF

80.1 KB Created: 2021-07-02 19:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59b1a5b6c759b397a8ae9e45f1fc7e4a SHA-1: 0d82e1c1e970e9ed0585198771399d7263900090 SHA-256: b2885cef277f937fb2898d4855b821fcd6c85da541c460e57f1b19e0e779d497
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosting other PDF files, suggesting a link farm or redirection mechanism. Several of these links are hosted on compromised CMS upload storage, indicating a potential phishing or malware distribution vector. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gramercy-grand.ru/files/file/925881034.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe73712ed---pegilenabu.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/panujugipa.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e073e4d322---56949917943.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/vezisejikavesakafijuser.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/25285957696.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a527ebc---14791976266.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/rvls0h6cbff2n23gn4afd9c39o/binazapakavidulukikixibug.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5vj1d2f3jbn8vnh522vcqa5np1/52785874142.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3bf3854b---96757088260.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/6921163939.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/gituvesufefikevufin.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/jakibolu.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/20987571315.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bae525390d3---rojusalevopajoderimibu.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bg3ba7tqgo5etln2d0u7v2vd5a/20765842448.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/781534135.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/rafuvizenizobinorabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=spiritual+meaning+of+blocked+left+earPDF 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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 16492 bytes
SHA-256: cd3db2751385fde638c1eb439b365b0834e6afaea1199606c204aa0bbf5be5f8
font_01_sfnt_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 11204 bytes
SHA-256: 2cae025fa86ab27d09c48130ebed58cd0cbf875fff09c9a373c0d2f407b582ca
font_02_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1