Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ca51fb6ebcac23…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 05:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27b6a1de3ca37fba8af366b83490e3ef SHA-1: 9d2ff6d35885d01ca1ddd09725f98e5541e03331 SHA-256: 26ca51fb6ebcac231706096db7c758d9f7ff1b080755721ed2c36c9a0dde35bf
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick users into installing malicious software by posing as a necessary browser update or plugin. The presence of numerous links to potentially compromised or disposable hosting sites further supports a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://divorcefinance.nl/uploads/file/5050584016.pdf In PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/niruwexa.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/35750466915.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210905_235951.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/93369060415.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/90347203255.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/rapoxowepizi.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/46157084985.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/89025260059.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/50226488452.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/12247919217.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/48809673994.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/18347331619.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/87934040105.pdfIn PDF document text
    • http://yuli-china.ru/d/files/13777787403.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/26752013716.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed2a4a47c---riwifujimajotede.pdfIn PDF document text
    • http://compsult.net/userfiles/file/74876084855.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/clr80e4bhbdo7r6fbe1sl5j51v/33269058531.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tazowaratosimapekaxagozu.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/39517439995.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/42381202834.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16131d3793a95f---66263812110.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/xexubipupefasasebijet.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/wizidewuniwekaxojig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+block+ads+in+android+apps+without+rootPDF 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_off0000d396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD396 17312 bytes
SHA-256: 2e348994113dcf9276aa14d8eb9f48b0bd6d688bc68df3148fdc8e70b082712d
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 10888 bytes
SHA-256: 6b590c67040e7432c29b94ca18fa564dd0483a7ee8cb4808aed7fd225c143a32

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