Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8d55c7f7c71c39…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 04:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5af52a3316946bef424f9632c34c6099 SHA-1: 6b4b240e0190d05b0fa06b3fd4d7874f0e34e86e SHA-256: eb8d55c7f7c71c39ecc8459b90e882141d2ff25b3d6541598253c4d836ee1afe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16030d26c7f7006c9c3e97fcc6abe0a0/fikiwijude.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/44480314183.pdfIn PDF document text
    • https://schmitz.cz/res/file/6150129642.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce0e2aa1e---zelagoxesaroxupamije.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082805b99062---jarogerotubivov.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/5076d3d424616164b0834894378235e8/66011893182.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/96891799374.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b03c4f36214ea4ea390408df602262bb/tawifobidabafadez.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160735561a9b83---figiwosemijagidewejemuno.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/jefojitasetudufaso.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/dilemexomovaxin.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/66646795366.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/tirupet.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2b45032bb1159826b1ddbf82e05dde8f/54673696766.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/78576061146.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/61bchcghc87i0pf0g6116ho974/firadijavomaman.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/65652895811.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/wesevexedonikatelagexo.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/64844628264.pdfIn PDF document text
    • http://novichiha.ru/pic/file/9522211574.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7a7a4b394af7c6bfe707b2fa49722ed3/17242331559.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/90196949469.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/tovapiwikokim.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09f56ae68609a7d854f2886fb03be5f2/12109218572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=sql+query+to+get+data+for+a+particular+date+and+timePDF 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_off0000caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 11232 bytes
SHA-256: ff6107734aed7365d013d1014f5001fb66adb6e90cc52c62f1b055c750aa6c51
font_02_sfnt_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 17092 bytes
SHA-256: 4a00e2053e02ee037a6b6da739a82b8ccd3216f6982a4bd8d736958621bc8187

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