Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d6610d998a2bba…

MALICIOUS

PDF

93.1 KB Created: 2021-09-02 12:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fdb0306742e2b86334aee8a4ddaff57f SHA-1: d177d087d942b977c195fbb2d1bdc26bca225fae SHA-256: 96d6610d998a2bbadde3837fb9bbc5fa89d669e61f422ccc319c6476d10c03da
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a321bd15ccb---4177875764.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981ed0e0df9---38466026762.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062303334973499.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969572b5ded---vetiva.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/74941760528.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/66239798962.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/wijivevete.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/73ee3635487100e7ffac7ca8c69cb572/tagitomutapexanifati.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/b7ff70af6530875f1e729e0cce64ba4f/96454889848.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/05d8f1972094e70777faf532601ea247/87417887816.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/211944201839.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/fikisibariwitunik.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4b3dadc7f4b8bd0cf96afc5f0801fcef/51756544454.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/16445915006.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/pibapamuxom.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/duxagamunap.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/fudixalarewirurokibenupu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/f3a2d87cf56dbecd4cbc7c6c16b0ad0a/67788697235.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/81709424940.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fcb68b9d---40701757947.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gh9aoo2gdlpfojt79e7gbbvhee/vofedipiwebujibuloru.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/f61e939f463889d7037cf5014c3bd6e2/60421515574.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/94627140052.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/56569857067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=aggiungere+foglio+bianco+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_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 10748 bytes
SHA-256: d1bb56d57a6622284167fba3def7a89d85d523b634030da67887d0a9bb5261ea
font_01_sfnt_off00012062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12062 17472 bytes
SHA-256: 29d9c84320b7b7c0634f12f193613bd98bb3bcb28b32aa7b87b4a04706b55bd4
font_02_sfnt_off00014e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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