Malicious PDF — malware analysis report

Static analysis result for SHA-256 088bda8ab51f4371…

MALICIOUS

PDF

81.5 KB Created: 2021-09-17 23:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3000bba441e45948e98fba7ab2838b7b SHA-1: 5b97dd75f1f80b8f35e454d4a009d57b3581964f SHA-256: 088bda8ab51f4371b17d59e85b3462dfad44732aceb246d2df491697bc36b3a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, providing a password to bypass gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://otohondamientay.com/upload/files/gibapoziturokopidizutiv.pdf In PDF document text
    • http://tdjl.com/uploadfile/file///2021091414283857.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/luxolotaranor.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ncmkofjqiv2qlh2olmdhq156d1/41539546809.pdfIn PDF document text
    • http://rilta.net/userfiles/files/xinuxezibubokutawinejuzo.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/vixinofubadem.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/40856848469.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/20298168113.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/jofimawimesefufa.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/xusutu.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/xowidetavogafefimakib.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/15027365692.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343261dc0c6---juxofepovevevin.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/43759120207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a698d61db2---mugeniv.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613eeb4d7b93a---82226622268.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/40217682765.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/8toe387ni91m3fsc8lau7d2rq0/97695085378.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7cefa607a---kobapolebixiwoju.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/79145474783.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/zujozizifig.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tasodixapixexev.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/48993799284.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/rovuxowof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=configurar+correo+pop+en+androidPDF 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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10612 bytes
SHA-256: 2044b32b2c8b8b10c6c4ed9be00dd603e1fd2a2dffd231b2244c00992641060f
font_02_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 18872 bytes
SHA-256: 3950ce7736b5356dd9d473e0e1a73e5c22573dde875edd5e2d4d88311c6ef6b0

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