Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb8a7d62665a51b…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 18:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1ba3ca3ec6182f0a167f0fe3eb18c99 SHA-1: ebc2aff86e5fe1ff2863bc03618f570249949ec1 SHA-256: cbb8a7d62665a51bed930808510728266194badcbe286c3017d3293b907ba6f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, pointing to a strategy of distributing malicious content through a network of seemingly unrelated sites. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://npcbalkan.net/ckeditor/ckfinder/userfiles/files/fetuveponofuzezuvifo.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba86918b877---73402268174.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/32175ba9237f1ebf830d2e096a268d08/50349241781.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/89593254278.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///82461562477.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c665ac9c4ef---49781189799.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fs0hjuauemj8jr6beak0j8lnos/mikopukodimisujeser.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/lunibojefomimuvedo.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/diruzi.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/sixixaro.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa96d76df5e---ralixarodipejuditerobogex.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5439a0f4794d82bedc1e931028ed6ae/fogufodadomilul.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/juvijogogodidodilin.pdfIn PDF document text
    • http://vce34.ru/attachments/file/23592591285.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/medupevi.pdfIn PDF document text
    • https://fond.ru/userfiles/file/33387157737.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f502a87f7fd---sebanavoboxukejoligifenon.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/nizudenotigedemavolujuwix.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/50702688042.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/buwadexatojoluboderonije.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/9924973006.pdfIn PDF document text
    • http://greenbrier101.com/userimages/48390238632.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2711d2cf5ad1ae1cd5b46008fc96862f/46672659848.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/siruguk.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/lajowig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=encyclopedia+britannica+pdf+freePDF 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_off0000bddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F4 10680 bytes
SHA-256: 3a1150a4eab08184d4e8c254a05f2df6d381688369a7c192026dbc8caee97be6
font_02_sfnt_off0000ee4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4F 17236 bytes
SHA-256: bcc6b4bc8c07f9067fa3bbee8e8f726fc205186e0eb0f8c4fdd345d4e445e048

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