Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16a8b0b4be5cdd4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 06:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11e7d0a7aa743d879d1f42d7f8d58aec SHA-1: ba42eb1a21626b8bb76d1527d7d3748ca1269b70 SHA-256: e16a8b0b4be5cdd48b0f7f0672eefb6193892174a5af9143c31b75f4385bc49e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://inwebjor.ru/uplcv?utm_term=polysiphonia+vegetative+structure PDF link annotation
    • http://ampletrekking.com/userfiles/file/nidexelasidoko.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210603_D15F0CD611C3DE37.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3bc61a543da1285538da1f90218cb52d/96357101668.pdfIn PDF document text
    • http://zzquansu.cn/d/files/94260648514.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/damimezajebaxodo.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/14534485334.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/37851162941.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/28372611310.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/985c0d1752e50c5cce293fca042e3c72/mafazabasofafujukijov.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/59263522595.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/gubegegibemaxapom.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d174e9c97---senitoze.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/60917584177.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/bijobudewarijomuzado.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/damobupewibuzelor.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e30293c75---74956234097.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/54126992733.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/kixaliji.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8294e1006---62995931496.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a85de26dc0---kidit.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6725e579f09e79cb668d9507f9af84cd/natevitefi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdde68920d---juwamewozubet.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l2t9neg99gvogii0n1gb1vn8j5/80547521584.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2d7c4ac31209da27418d271b48824c3f/kazize.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/55099099394.pdfIn PDF document text
    • 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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF24 10932 bytes
SHA-256: 97d249bd57b978121b2e8a8c1fee478525acaeb95d4ab8c479af6a09a204b35f
font_02_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 16976 bytes
SHA-256: 1d969ed66f40e95b58d290da3ffb08475ea0c051c8595695057466f6e8b20245

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