Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99a32a934d44787…

MALICIOUS

PDF

74.2 KB Created: 2021-10-01 18:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 833b4e400727416a61f04e866339a5ec SHA-1: 1bdf2b1f367b03964afd3b04943909f50f801a54 SHA-256: f99a32a934d447873e2dacc3c31c2795f99c009dd2f316f2dacf90f8f8d10e1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, 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 is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://pnktools-th.org/ckfinder/userfiles/files/wexetaxug.pdf In PDF document text
    • http://assytekservizi.com/userfiles/files/39090643330.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909143854645953.pdfIn PDF document text
    • http://otczenacts.com/media/files/mafinevatulasekifedo.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/powomudaserewerinu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1d00b09f2a0a54ba043de086b5357a83/jijer.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/peluvojeludonanovamul.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/12c3c37f29d8c9d1ea2fe4059dd42f8a/36934610565.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/13651457259.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/52708331999.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/6758310091.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/44501322700.pdfIn PDF document text
    • http://msiutilities.biz/documents/45531811863.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/porimefefaf.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/43514064808.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/68774589132.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0dcf69428---gedalagabiximadodulemo.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460ad7c2ac8---92027677946.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bf96bcb0---67551490285.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/09kg4voenmmo8krvmrre8h1ur6/5183428272.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/pafuwiwusazotuxo.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/juvibujos.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/61616139539.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/74235508019.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149bd000f0d7---18493448010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+drucken+%C3%BCber+fritzboxPDF 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_off0000b93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93E 10760 bytes
SHA-256: fc0fe46ef2176634af075e599a4bfbc0b9b4c4244947a2a3f8e614fa8620d89d
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 18388 bytes
SHA-256: 2a75c308eb1577710414b74353a94774f64198b13c0f8619c92645869bb4f816
font_02_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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