Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e654e85acf5af4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-11 13:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee7a180dcdd19086886e63107575d66a SHA-1: 6733dbca45a7b381c49f8ee47dcb78e3d64abfe6 SHA-256: f9e654e85acf5af4470be7046191ef0a900baf1cda3e805c36243cc801fe165c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs pointing to compromised websites and disposable domains, many of which are structured as link farms. These elements strongly suggest an attempt to trick the user into downloading a malicious application, likely by disguising the download link as legitimate content. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=gdmss+lite+apk+download PDF link annotation
    • http://igabana.com/upfolder/e/files/20210908155746.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/20102384497.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/26316255150.pdfIn PDF document text
    • http://recviem.ru/img/upload/gogimutebisegomukumi.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/robuwubazagi.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/10900805941.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161300ed158d5a---38474410893.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/digirabexexevorexaxo.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/30690831879.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/829fadcb9419db2961a7595479d94cab/85966947081.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/32345606674.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fisuzazalogafu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/vuduf.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/40798353293.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/51403639340.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hlnfbhpjdth3qvgr64b65hqqs1/31448609586.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/dff6ad64dd653c9a2900b78a9fed17cd/75544824918.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead09dc94b---wunogodotolejozozenabiz.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/livapinobona.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/32498559280.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/81008621938.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/nifamirevutujimolupoxipuk.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_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 10672 bytes
SHA-256: f2d3ec373d334030c8a9887166f5b35bb8c9834cbc6171a8d4cdffc831363211
font_01_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 18268 bytes
SHA-256: ff2933b1d5e8b278586f81cf9cf7af503e24f7e7011c7783be1cfcd0a67458f1

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