Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2417dd8daff9d7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 12:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 261c8eee0e6ea89ae8bef9af44abb79a SHA-1: 9b69fe523a4468184dc5cd6990bc5a9d93d41254 SHA-256: 1b2417dd8daff9d7b1dc30ebd6b52a45e4dba213b4e79c20d4236b5ed3f285fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a804c450da4---peduruwutakilapemugefa.pdf In PDF document text
    • http://studioaba.net/userfiles/files/63006754929.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/94205606483.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/78326098544.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/xezanotavotitiwo.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/45851740354.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/nogata.pdfIn PDF document text
    • http://proxima-online.it/public/file/waninibimut.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/68168014975.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • https://webmenuplus.com/images/file/serebedifudimotevuru.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16752f0ff---19571327190.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/53194979653.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a0016c57efaa179f1d22530f7f164fe6/judopivinidinavutusuni.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b81f76e92---dusakujipi.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/vomeji.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/dusarisozopurunukosake.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/64307509940.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b04bed4e65---34844382912.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/dasubalurenebires.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021082918042179.pdfIn PDF document text
    • http://flavourit.com/uploads/userfiles/file/file/najenuwijosoziwepawel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=instrumentum+laboris+2019+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/tuxodevigomeliroj.pdfIn PDF document text
    • 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_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 18320 bytes
SHA-256: 3d69177fcc127d939de45bd5da3e0cdc7496ac20be9da186af0c04c12c9faa34
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 11312 bytes
SHA-256: c2340ef1c5df4347f5074e05f282449ced99e8768ce2db301894c9212baebf99
font_02_sfnt_off00011d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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