Malicious PDF — malware analysis report

Static analysis result for SHA-256 763b8e094eca5d35…

MALICIOUS

PDF

72.8 KB Created: 2021-10-04 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 574c3a0b7ed92c0d4ec0a549babcbe9e SHA-1: dd8670a6735ce9146589f3a64cc693af591f96ec SHA-256: 763b8e094eca5d3589633e3e8560e9144e4649f45f211038d790a4149e2588b5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content or lead users to phishing sites. The presence of numerous external URIs and the nature of the hosting indicate a campaign to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 https://viboot.com/ckfinder/userfiles/files/rivijilexukopaguv.pdf In PDF document text
    • https://siam-royal-view.ru/data/files/40081421054.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/93470987878.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614064fc9ca81---bazutowu.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/lanagalixavevakip.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/1709693811.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/ridofaxa.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16145d2651a8ba---26817542065.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/44119147179.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/jobif.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gosefudakosom.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/45724085518.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/fa3d629d3832d7c38bbdbff21cb83470/rulonupor.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/jovane.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/14423453403.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/nboia7ght67lspufcet3t4vpg4/54855846213.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/jiwutezonadivopawamijev.pdfIn PDF document text
    • https://architektor.ru/uploads/file/62572301492.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/bojerisinufigusimazovov.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ceb0d895---rutudi.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/majiwuvipedipeminip.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/25600166793.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/wisixezoropobakegudazex.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210920_155943.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/gikavenuwufa.pdfIn PDF document text
    • http://liyangah.com/Upload/file/79635044818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=new+mexico+songsPDF 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_off0000b9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EA 10332 bytes
SHA-256: ecf316ed62199b491c8f9b8740c0b8f06936b7123d4ba6250ebfd17b5327e302
font_01_sfnt_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 17352 bytes
SHA-256: 9cb2cbd1f94959aabac552441e025a3b9e35d1df60e47159be509e06b0e5b111

Open this report in the interactive analyzer, or submit your own file for analysis.