Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de9631f0cafa9da…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 06:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 002429c2e8d257f17a231c98088aa56b SHA-1: 8f0c96a7a426df202a510c1ce9ce3ccc3d6da3f7 SHA-256: 7de9631f0cafa9daf9092e5a5eed02edb61e1a12d16660cc861b42287f677da8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=costa+fascinosa+deck+plan+pdf PDF link annotation
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef018ec4f7---japurojijupup.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/13844727800.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/83838129771.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/6644973433.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/2677247154.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/repega.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/nolasuliwafuseganulugetis.pdfIn PDF document text
    • https://qnzar.com/files/wewazeresodumafatakojoke.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090158829475---tazigebewezuw.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xabiwugabidexogutelukipo.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/6937890216.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/kodeji.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/wagoderek.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/48282467113.pdfIn PDF document text
    • http://djapm.com/userfiles/file/kodapojepidimeda.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210802164227_2038217497.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/junorobadonuvum.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abc651a81b8---puninodinemem.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4kgdukdab5932kt45k3bmh13i0/wurokul.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/juwepogojovalifufoke.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210907093633617212.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7465f3f6f2---92236846637.pdfIn PDF document text
    • https://thinhtienjsc.vn/images/news/files/mibilusegole.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_off0000d3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F4 10636 bytes
SHA-256: f7fdddf5dc1c8bcdd912f319fdcea49efc4c1573738a15eed941cd0753cad5bd
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 15952 bytes
SHA-256: 5f43cd0884710322ab08dc57ac65c7cb05016b198a31ab38f2cd08cd652a8d16
font_02_sfnt_off000115c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1