Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672ba84740b9869…

MALICIOUS

PDF

92.4 KB Created: 2021-07-16 11:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa341cea8a83b77229efdf672959d225 SHA-1: 41907c1090d818f57b175277a201f0f92268f103 SHA-256: 7672ba84740b98692581af141b8222f2546ce89fb756f386d5dd801e8d645748
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sawira.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e2c2b126---bevidegajilibafaxatika.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f74444662e---75993692713.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e4bd47d30a6c05f45fbd0e63899d940e/10269971693.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/13169616702.pdfIn PDF document text
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/88898468290.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/vlt2stvieeahqkpb56titi7v98/piludoxabefabo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f388a402---66079610501.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/zegun.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3d21e71f565e25b3f7b0fc6f9f1d0bc0/43107001908.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/dd28ef63cd5c408d8739ee4da9224935/18324347659.pdfIn PDF document text
    • http://usagimatur.com/files/others/87864409970.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/moxinipaparobagonono.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/kopevosedajoranum.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c37725e31f8---8486834884.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/2897664883.pdfIn PDF document text
    • http://winso.tw/userfiles/file/navatupoki.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/95275338267.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/tibameduzotepisopowux.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/xunabeduvonu.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/56229979918.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/16586643703.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/pavebexubak.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/ebe2f40b9a5e28eee2ddbdf14d70f23a/lunodoxaledexamura.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ffd0fe330c29e05ab6e6f48c6ba97d97/subur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=one+punch+man+ch+134PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 16776 bytes
SHA-256: 0a9c4304eeeba871923d38bc592a67142633fb64abb791dcacc742b15faca899
font_01_sfnt_off00011026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11026 10248 bytes
SHA-256: 3bad7c359a1a5ca3a035c487f5d3cfe7918fa03a302882216552f14aaae7f869
font_02_sfnt_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 10444 bytes
SHA-256: cfd2b973bd564289c41d8eaf6dffbb108c8bc0adad2abbc6f7081ffa840cffd8
font_03_sfnt_off00014a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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