Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35f00b958ced53f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-11 18:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 057256c58df24a6b62734bc55f622b82 SHA-1: 419ab229e9ef25e5e8616b88251e111886e492c4 SHA-256: e35f00b958ced53f886079af3a27a7b8f66d127ef706c1c8108106fe7164fa8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f0a05b618---63001148735.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a39f27b555---74342246464.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/89979197825.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/42557591961.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/56261217345.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/27829791306.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/23750545641.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/bipukovar.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/pigurakojid.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/kawupojazuzaj.pdfIn PDF document text
    • http://packamate.com/userfiles/wededonusutoramotep.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5f1c15a99c9cd243f2d543596915e4a9/wubowipuluxosasejapizul.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/53742784115.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/35326406456.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318ce199b42---sugazegudodoru.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/bofizi.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/zovetu.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/14804221076.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/al3ukepfa37ggl0kefloe5q2jq/tidukesaw.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/webepegitetuzabaku.pdfIn PDF document text
    • https://tpk-m.ru/files/file/7260658746.pdfIn PDF document text
    • http://lactopad.com/uploads/files/titasugurobelozuf.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/gipur.pdfIn PDF document text
    • http://deforma.it/userfiles/files/41681394841.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/84094069061.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/boxoxudakegifawesibovil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=photo+maker+app+download+for+pcPDF 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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10804 bytes
SHA-256: 05cd8d5dba80896e63930e78feb0285b26f017a2952efdad29badc43f36f2998
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 17644 bytes
SHA-256: 1d11557b3d81eea2479cffba0c7b2b1f879ef7504502c91e1aab1df3d3f4d29c
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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