Malicious PDF — malware analysis report

Static analysis result for SHA-256 0924a9c6b2518f71…

MALICIOUS

PDF

76.3 KB Created: 2021-07-28 01:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 65c577f41455244df6e4061643dc263c SHA-1: 0b3b50561c180220ba3b8e91139567f5530dfe9e SHA-256: 0924a9c6b2518f711537028bc6edb623addc9e1d14b10f6baf29379b3beb9bec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to other PDF files hosted on compromised or disposable websites. This structure suggests a link farm designed to lead users to malicious content, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b0af17a7b04342c1ea77a09bd7ebe5d0/kezilig.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f0c8ce10a75067a900f5114ca242656f/tajiteliwemesuwibaruj.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/68746626860.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/jabefumafobinaf.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/jakijuworanopuj.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609107f4de874---19167154792.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7949b8e5acae6e190f86eb39ed442d7b/kabefidasawi.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/mblc1j7rh01nv4o47d1fq42dqg/waxogasugud.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/22141918197.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/39aa93b7296c7e0f24269d68bbef339c/92185521467.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/90570382622.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/91fgod4osov0db1ke68m0o7q41/zameb.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160767337e2f6c---27722326851.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/qel00o9pmmo0ubj8igphu53aqp/nexanurujeguvevavene.pdfIn PDF document text
    • https://stopserv.ru/files/file/47838803575.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/961bc29914ebd4208b3a7f38f64fdf43/83981916237.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/50024852477.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/b5aa4c45619c7169a55c350efe18fd52/difosula.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d07c51d7d4---10690704729.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/51463225330.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/99e79c2cd8fc690b12aa2bc4b995267e/dokawub.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/petenefoxow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=percy+jackson+and+the+battle+of+the+labyrinth+ebook+free+downloadPDF 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_off0000c6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 11136 bytes
SHA-256: dc730203e581d584182d772e64a579f0f4d8f96d9ec844e11ebcb50dd0f9625a
font_02_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 16336 bytes
SHA-256: 12597b92e789fa5333c84ffc135556b7c80dc50a6e9978a544693fa65e7e59bc

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