Malicious PDF — malware analysis report

Static analysis result for SHA-256 0162480db4dc404a…

MALICIOUS

PDF

70.6 KB Created: 2021-09-05 22:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5023fcca0117e1b18d4dd34d0090eefa SHA-1: b12ae6969bedb952ee6506ba8d60c37072e806a1 SHA-256: 0162480db4dc404a4766e6484220849811a1fcbe4d3c0017156aeb9336cfb044
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://toroisg.com/public/images/files/59190521591.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fbde2946---10403806154.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/digenosupakesoz.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b461b9172---76210889847.pdfIn PDF document text
    • https://baptistfriends.org/media/vomugogutuxejajul.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-21/20210521124500203008.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/86131857950.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/080e5786b58d8d517abfa72472bde9d6/zupefujigik.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aafcf5689da3f1106890505a1625996d/79708428879.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/18424571592.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/sesufimarolesi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/bopuzitonodobemobawejo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ab9354b2---52766117724.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607839d63962c---jodewopotixex.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/icdic0p4op0qsklpsaipji6pe0/64873058091.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a466e42a475---26305984387.pdfIn PDF document text
    • https://iwistw.com/upload/files/bumuvevegegi.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/dokazilipozodorekuvuti.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/17b189109f4a5c1ba08d9122f23d220b/55342927396.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f730c6d29a---55066104687.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/140c657ab588608930fff7a984f50e55/wurapuvoresuvupob.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5c383c5ad---25588924351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=birdsong+full+book+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36D 16568 bytes
SHA-256: 783a214ac5df2f4cf685e31ef8d0fc512ca7d93668952fe290903817b819de05
font_01_sfnt_off0000dcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFC 10668 bytes
SHA-256: c3ab86e38b6813d1746f1f822a36a31ec38e60ea30b0d2311116dc061c7a2afb
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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