Malicious PDF — malware analysis report

Static analysis result for SHA-256 2511114ebd8decf5…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 04:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f49bed559f68edde0067157a2959e0bd SHA-1: 34ee954a144b2a6859bd659bc945ac3d519be5e7 SHA-256: 2511114ebd8decf5d8cca70caf2a119f073034b9f84b5b34ed89bb98b2cfa35f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, indicating potential for malicious scripting. The PDF also features a link farm pointing to various external domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded JavaScript and the nature of the external links strongly suggest an attack pattern involving user redirection and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://mimpishio1.com/contents/files/tuloguvabedomifokemev.pdf In PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/98631994381.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/65713700885.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/vivegubeguwisa.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/29975922823.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/7v4piiacmbbronhdjmqsopcbnb/tovunamaxebizanemujuwojow.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/30208390445.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/43938401661.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd047619ac---limek.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/26426956343.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/popovepigujobis.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/5452180594.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bd96709ff---5265057853.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/vilop.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/kamunuvasos.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150558136431.pdfIn PDF document text
    • https://isleo.com/i_photos/file/95554027262.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/duxirupifoxopida.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210906064448.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6e4eee40c1732a71d0ca87b2ddb8c9da/xudavemitaxowasodababix.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/9171684138.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f84b0c99f1---maxot.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/vituzasularokopif.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44902996937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=swift+streamz+apkPDF 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_off0000bec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC9 16476 bytes
SHA-256: a8a143331e1f52427cdc3dc4638236e9b5c1133fe944f36885d8cd3fd8c7873c
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10560 bytes
SHA-256: 822069db4358c43614370980af1c9fcef55451794c2de1f004e513cca5cf8928