Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a7893dafa673b2…

MALICIOUS

PDF

91.1 KB Created: 2021-07-21 11:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3df3a8b63087f99d945199145477b9cb SHA-1: 5ed5d1f6fc9b6298bb44ee3ccb5def54a7815e46 SHA-256: 23a7893dafa673b23634f0b124f69015844abbe85d8eba0659458c37f3bcae5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, further reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://creativetechno.in/userfiles/file/gapumumimorefafobame.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c87e283ec---kaxozavajomabumedakaxot.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e09573c404eb0aacf1d1190f18c7a2d/zekegajapataronax.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/21624011361.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/66811404177.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/85176305988.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/48836963740.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gewozuta.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a94d4ef6a45a88e370b4f6a3a537859/81728044555.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3ebd2fa3952867141446dab37aff5baf/59118241540.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/soranrmq7c1idsprvsu0r4dq7i/97942236200.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd37f0c93dc8c3bb5c431c3e39b2cc9a/jokivaralomunuzenaga.pdfIn PDF document text
    • https://cape-electronics.com/media/file/fosazinezasapojumuloronew.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/ro4otlied1l730ovn0d30v1tum/6444657207.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/40654524901.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kopevavaxejafipizemavuk.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5e0i7jn0bvjj1va90ktfcgrfk4/ralakifepopiruwub.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa315d1c2c---tusurofolitomu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/493bbeb71005215353739a9c4854861c/69699507568.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608423a1a9ff9---webavufogu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/8248867d389eb68c6a644a4cd02e7add/55742045016.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099c3e21c0a8---zozomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=accents+on+capital+letters+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 1976 bytes
SHA-256: 7bb12e6990cd2fbb40388239a81673f305cb96c8e4c80aa081c41827f455cc27
font_02_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 25836 bytes
SHA-256: 42814d7833214f580b82143f9e22e1c44f25f63063a1e9cf1d828b4a6d2b50b8
font_03_sfnt_off00014707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14707 10452 bytes
SHA-256: c47761eb6a0a3c0090e494d68b357bf37b33ae77b92dff04043ae6649eabf78f

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