Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16e0879c7784b0b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 02:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d011792dfa8f838cc521bf720b80162f SHA-1: d184346cc9044daf40f35f70c928f55608cc8d29 SHA-256: f16e0879c7784b0b0fa18691ec26b0096f80ff1410563b21805643a7cc10625e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the primary attack pattern appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://birons.net/wp-content/plugins/super-forms/uploads/php/files/776d5c085aab8e5e0ca7ce828a534706/kelude.pdf In PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/08a2c8d55725015ce040d8ad9aeb1315/rulerame.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/696f9a54f38fd9688dead6e0c8712e5d/8237968296.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161282b8ee69f8---46886564765.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/mutawejapejinilive.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/9246927442.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/75627835798.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/segakiba.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/81122892706.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/54692027528.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a047e3329---noxukatisenojun.pdfIn PDF document text
    • http://oodow.cn/upload/file/210717040400385712pttjr53gebsv.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/tdef2r1emtm82u2vdu8d71teh0/28938976163.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/badugijije.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29c19c147fc36cc1223aa63cae2eac11/62634542387.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/bulamesuresara.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5ddfe5455f5b547d168a427145ac83b2/79054224781.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611d00c49cc78---31067539658.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/lebakur.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/a15ff6dc3f5c418ffcd16c932221985b/bixebelativasexisulugawet.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/63950448466.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/kanosi.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/oquk72dlogg8rlkiha5cs9au17/feren.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2ebc5776---dulapij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=solving+and+graphing+two+variable+inequalities+worksheet+answer+keyPDF 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_off0000b57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57C 11488 bytes
SHA-256: b428235365c443ce6b63d27939f9ba7126514c8014a44e48129ceeafb2da0c40
font_01_sfnt_off0000cff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 14848 bytes
SHA-256: 4194c147f8e2cc02d3c551f6659587392c521db84e0a4323dedbfc568e3d301b

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