Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8520a90bd5a5c8…

MALICIOUS

PDF

254.6 KB Created: 2021-08-04 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec1a14d0e511ad4882c6333038de20df SHA-1: 40e7c38893fb02c2a09d2af119e4ed6e630e465b SHA-256: da8520a90bd5a5c8944174c0ae1b32a065990fb907f842dcf15a62185f6d959a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains multiple links, one of which points to a compromised WordPress upload storage, likely serving as a lure to a malicious site. The document's structure and embedded links suggest an attempt to trick users into visiting a potentially harmful URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 5

  • 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.
  • 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://merlegdoktor.hu/tmp/wuranizubofoxuzafexa.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a05145e5443---jogelixakafuniwumerom.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/54129847149.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/23259982242.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290ad2c26d---labatadizemonu.pdfIn PDF document text
    • https://ever-progress.com/upload/files/kaxisudaloz.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b77c076ff9f8dd535736db1e2454d9ea/6039338141.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/popezaf.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/jewopexoviwobaxez.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917b446d1b4---65447751811.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/duvefubebuvozavozif.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/roruneb.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b25fbb663---20451639869.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/87510730177.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mnj58kfdult6jf12cq37fslfd5/47604156238.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cb9ca139f17b99bd409bd12c9b2c709d/dokokukereker.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7750c6f2d7---tugoremutowixodosi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/83t1r1vu19cj24cf2026rvdnm1/65216457852.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510055718.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/85f0621c541d51d864e67358b7261dae/35016909065.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/24458925243.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/32789044256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vocabulary+practice+for+6th+gradePDF 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_off00038d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x38D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0003a53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A53B 16648 bytes
SHA-256: 5745152afee3988b4fa0c90969ac489eacc19a32269154b57934465104e298e3
font_02_sfnt_off0003d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D081 11120 bytes
SHA-256: 6c414a3e931911f0fccc6fd4a8f28077f0f8b84aa9156b75954a56578251a9dc