Malicious PDF — malware analysis report

Static analysis result for SHA-256 8712eb75b84cf4ac…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 23:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24a0637a26e810258dc0a90e5b41ee2b SHA-1: 327e632a570a85d27f7b9cffb7ad6c24d6fadaf0 SHA-256: 8712eb75b84cf4ac0e29cbe667a11012ccb042a1abcbc60f58704044be7926a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple unknown URLs indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://musikpark-live.de/userfiles/file/69098320662.pdf In PDF document text
    • http://yfatc.com/userfiles/file/6802701406.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b78e52236a4---sonazubogavudaj.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885c0736655---newireragitobuvedudev.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/mabew.pdfIn PDF document text
    • http://liyangah.com/Upload/file/mujewisefijideranoxagi.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/pubotav.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108070445503093.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/tobobumusamenipopi.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ns8pt4jh90t9srrpmmd59c6pd4/26804899672.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/defunerevofin.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/53934333719.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nenatazo.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/f60995598cfe84fff96b08aa0d5b5b6f/morusajaladuwapefi.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210623_232436.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/zaliku.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae92faa869---879032342.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210527_9C1D3CE7E5F97E95.pdfIn PDF document text
    • https://rajakedua.com/contents//files/zodegeviwunenude.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/246a84e913f879a6344e17137089a866/63858921273.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/33906040495.pdfIn PDF document text
    • https://computerzone.pk/file/61099319085.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/98188827253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=foreign+direct+investment+journal+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_off0000e514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE514 18780 bytes
SHA-256: 3b281df01473d0f4512ccb64d63f26e6fa882d6cc6c0a40861d3fc3b2bf022c6
font_01_sfnt_off00011645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5C 11236 bytes
SHA-256: 01bedb3a7365db54f537487b60b30c8dab25de62cfc5d1947c10087fb57fe242

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