Malicious PDF — malware analysis report

Static analysis result for SHA-256 959528a19f3d2afc…

MALICIOUS

PDF

97.9 KB Created: 2021-07-02 02:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ed448201be2cd82238dda174069da38 SHA-1: 1bae9f1be280736b75e7c31c7f57f54e6b82dc0a SHA-256: 959528a19f3d2afc84853f2a7b25d6b01fa8d637d66d62ed9bee4d9b82890692
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into downloading password-protected archives. The presence of multiple links to compromised CMS uploads and disposable hosting, combined with ClamAV detection and ML classification, strongly indicates malicious intent. The primary goal appears to be facilitating the download of a second-stage payload disguised as a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/abc885524098cec614678f3eb1214357/wutuganurafitobutegebosiw.pdf In PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/66b4e3cb0945ae7484f9782bfcedc219/76355152214.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/wukurel.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/kidefedokojo.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8efed27edeb5c11d036c9d29b0978a26/godojujezuzaf.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95155d20a9---kafolezojifarazukoxokufi.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/bumuxunug.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c522fc689ea---25484595195.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/titeninabigudavut.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/17869513255.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021052802171973499.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/nokamavivoko.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/80728930887.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/94692494742.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/ad69cffa3048e5695a238c1991e99e2b/logogiragerotusa.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1223440d923a222fe1d92cae0f78fc8f/wokuporukusuduxozut.pdfIn PDF document text
    • https://12tiga.com/contents//files/totusobe.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/lawugadixaduvimisezimofes.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/wurivatititeke.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/sojagel.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/49846645700.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/58361698998.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/42ac195bbcc18afd731b07f1530294ae/sapiraxolanidodipem.pdfIn PDF document text
    • http://splogservice.ru/content/file/mitumadosoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+open+a+apk+file+on+iosPDF 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_off000105ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AE 17300 bytes
SHA-256: 48bf88d84b26dd03371fdf51d2f533b0bf250b567aa4e578b1371b48c3ad6de9
font_01_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_02_sfnt_off00014a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2F 10420 bytes
SHA-256: 691b06e6d3b049ee6606907cb13066baa799b84086cf1a424279381a468ba08a
font_03_sfnt_off000161f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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