Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6025e2c95c2b6bc…

MALICIOUS

PDF

87.1 KB Created: 2021-09-12 22:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2e8c85d82bd9f8275495c8579b85086b SHA-1: 25c12046a3e2fef6b8465973d6e24283e91e197a SHA-256: f6025e2c95c2b6bceb8fedb0344b7e177e55187571caa1d73376da5682858180
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains a link farm pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. No scripts were extracted, but the presence of external URIs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://chcial.ru/uplcv?utm_term=como+remover+licen%C3%A7a+de+app+android PDF link annotation
    • http://tuttotop.com/userfiles/files/17716394761.pdfIn PDF document text
    • https://shunnasato.com/24531388687.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/tikixirumodovoru.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/jodajikopidikejewagow.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/68407285116.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/64dpl1d12mdhe3n9rcnrkeqq87/zuworitotevavifisenigabim.pdfIn PDF document text
    • http://riviera.az/userfiles/file/930992569.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16139f66c5c722---55370232325.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090903022524.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c19d1b4066846490cf47b9f9b5ecd76c/zazarunepevazojotifapevuw.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/xolatoxopakofovijovap.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210906070252_2107670792.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109041346078523.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161393a5baf7f7---42584263426.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/61961419959.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c54cd493455ae9ee1f0e9b3a2932b0d0/midavulafekunikexubegi.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/juwez.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1630573222311428173.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/55116280662.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912234511.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/mejanizogifutolirip.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22303812927.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pokokelivigose.pdfIn PDF document text
    • https://mashura.co/userfiles/files/84413448931.pdfIn PDF document text
    • http://generoussecurity.com/uploads/tabig.pdfIn PDF document text
    • 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_off0000ed56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED56 19108 bytes
SHA-256: 98bfdc047cb1f7ada1bf19381e1b2ae0b30e4639465df365ba4e2dd32ec11b81
font_01_sfnt_off00011c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B2 10704 bytes
SHA-256: 702a73a964827cf24cbc4c3d8cf37aa38cfbba44e609dd8485c80ce3aaafdd2c

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