Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebb0c0d6bbcd5ea…

MALICIOUS

PDF

75.3 KB Created: 2021-09-26 12:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aaeba9fffa6c4d94e9e045cf2c26bd97 SHA-1: d9d36610cc866687cf52f9332cd773075dc24f6a SHA-256: 5ebb0c0d6bbcd5eadcacba79ed1d2c57eca9b63bad71f19f4fe2ad3bcd2d5298
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=crack+picsart+ios PDF link annotation
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/10430104144.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57798103276.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/42450169725.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/91480277937.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pup21ub5qd8bvmi8nv5jl32183/nenupomorataxivowe.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/54220002374.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/vujekame.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/samekenusufudipudeporuz.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/42ff6862a7ce2fdc82d052783174cfa2/21754986327.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/demefinotunag.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vebipezujafanujakew.pdfIn PDF document text
    • https://topupdana.com/contents/files/musejivawuxifa.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/38827652270.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/xekoxed.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/1100469977.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/58743273928.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374b5fd8f09---tukakedusodi.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210905155440.pdfIn PDF document text
    • http://cmtsport.com/pliki/papitakugejef.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/basuvepuxuxugisow.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/kenefaxakedozibibewidolux.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161417bc75ede3---11241401379.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/budilegiduxupebe.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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 19640 bytes
SHA-256: 49aa6f3e32d7ea2ea82a5621168c917432a81afa71bb14636fb5403573b65d63
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 10208 bytes
SHA-256: e6076ef6fe329a77ea051e02d70b6c0cc02e8e30f1a1e1d5d9b2031c5e86f73a
font_02_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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