Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d495cca2d39567e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2c556c580297efd5e46072a3880a2ab6 SHA-1: 808c7ccc2f89e10fd90bf514b6ebda686b9b791f SHA-256: 2d495cca2d39567e7fbca2575662b5a81f85baf4e39de699f5bf733ceed18552
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on various websites, some of which appear to be compromised CMS uploads. The primary attack pattern involves luring users to click these links, potentially leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/161140ed7963af---lidefujenefemidum.pdf In PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f495f6bc0cb7a7d52fe5a614d1f5d679/87735384690.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d3853dfe7---2947417710.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/kofamok.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/43491531358.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/lezitew.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898cd83e3b1---71387546878.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/74837261248.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/pakolobowibima.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3cc84f00cd452480eb022969cc98b616/54841554794.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/70918135364.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/64901024378.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fr8mgv86d1nuh01goe5cuhuabm/gugixakalikezugozogegodi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/diximefife.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/22231606287.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fc65b6213---fikarorolemigazek.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210709_46A6B91660742095.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pa3p5vdud387p0ij1b8rjo37sr/73240256989.pdfIn PDF document text
    • http://jaatkinson.com/userimages/ziresa.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202108201305012847.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d0bf8ec0e---10672193530.pdfIn PDF document text
    • https://btegypt.com/file/dezapami.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/37246659090.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202108311815267268.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/ziruluz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=nafta+treaty+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_off0000da71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA71 17540 bytes
SHA-256: 9eb57dead3ec2129de2e61b3872fb0a6068e6dd972e8dcc4a2e2033d279b38df
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 10052 bytes
SHA-256: f5f63cb7ec484062db07765878205f40f5e3bdeb070016ab51178502454a14b7
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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