Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbcf838c11f21880…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 17:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 47126e95f3563b79d516a2d58c2376ec SHA-1: 4fd1ffbeb5d2e34811aef5ca284dd6de764d9ea3 SHA-256: cbcf838c11f2188019c8dde109c9aba1b257509b49b3dea838d42480df3e6d1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://www.shadowrangers.live/img/files/nukajivijamobanikeb.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/4v544i51triq6uqra1pieemt8q/bopuwonesonelusiwo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf6159005---sajeniberedefamujadaw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6819e9c9cdf8363570af6c35b116afec/janutewexijogedo.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/rujizawogili.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/jukewabulamode.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4926093bd1f451297fb62bac86c5552c/rivirivopepago.pdfIn PDF document text
    • https://digireg.li/upload/dasisotofebutagelapexu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093ce3adc0a1---zibidisugeg.pdfIn PDF document text
    • https://ptogel2.com/contents/files/96590407949.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/vapedujovarazu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115be26a3978---pekedodo.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/zojogipedixururiloso.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/sezebewala.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160727c86897e8---70098871448.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/dowenojatunulozunilegu.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d69bf7e1573---50390536586.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/68612476320.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/gowujajet.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c50590729---disazelokujo.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/wimaxaf.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/xiniradej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=disney+fly+medley+sheet+music+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01C 10716 bytes
SHA-256: 65470b4a9fc6f7ffff19e1b05537b562b2c11a280cc7627fb27f6a2f0c87a8d3
font_01_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 17460 bytes
SHA-256: d56b53e55d0fe40e002c5c1b14b0f092b3f394f311a749e0a85226fc6500b193
font_02_sfnt_off00011514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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