Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36c94fdd14bea82…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 07:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ab472db948dd763775903abf578e45d SHA-1: da94f67f880e3fc165af9aa99b7bd48b09b1bc9a SHA-256: c36c94fdd14bea8224d8cd668ee80d44353456ee4818b99d33b6bbab9e9df235
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, including links to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/uplcv?utm_term=delete+history+from+android+phone PDF link annotation
    • http://nextlab-semi.com/files/fckeditor/file/dozewozepep.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ee499eb2824bfe2a337906556fa85e73/gogumajirijug.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/b6c55a5a22d062f70b6fd2c781a8c397/tajub.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/7095162685.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/benoxodobigasimomo.pdfIn PDF document text
    • http://classtool.info/upload/files/21270006094.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210918_050822.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/23909601812.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/maluzesujekofakugekuraku.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/37772149362.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jugiburosas.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/11125922486.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/16202208630.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/61072481821.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb9f8628d---83129691178.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614279d1b765b---31284515913.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/xigivanifipegevusi.pdfIn PDF document text
    • https://brod-plovdiv.com/images/77991533204.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/gulidujutakozodexamuliz.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/25213238992.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/deduwewir.pdfIn PDF document text
    • http://dsagco.com/Upload/file/bemer.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_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10066 10880 bytes
SHA-256: 5cec7768f4766a6f007def1977429182ecfdb11b2edfd0ad3a24232b71a10d73
font_02_sfnt_off00011961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11961 17656 bytes
SHA-256: 4d5b948ad6fc8adbf90d8a0ffa099a1b3e971c95980df44fad4d69bbf295a98d

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