Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb5a66aa9b2d5a5…

MALICIOUS

PDF

77.3 KB Created: 2021-09-17 05:35:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4d65fdc2ecf1cb149792890d1fb5754e SHA-1: 5f2a639071aa569ea83d974b0fcee6a0a1823907 SHA-256: fcb5a66aa9b2d5a5d4353fc8d0969d6fe652b3ffc7250afa163740f8f4f661b5
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 trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://ttc-investco.com/img/files/30539611551.pdf In PDF document text
    • http://railwaysrailroads.com/upload_files/files/28521283129.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/jawaruguzime.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf9ac821c---petibugatuwodexefotagune.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/xetulopi.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16143fa0755530---rasadodelil.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/9e11a52863f6aae44c8acc00d073d84b/12419698026.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131720018875---wisasajamani.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/nozaboligijizapulixeda.pdfIn PDF document text
    • https://esvigo.com/upload/files/lawozar.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/16143325450.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/56843553843.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/fubekegi.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/javururubixajobolumox.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/voluvezefega.pdfIn PDF document text
    • http://turatabor.hu/media/24225573349.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d75bd50dae---3502491038.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/tusafava.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/epph1mqjikabi3bigvlaf86asu/mevaroxotipaluxipunutew.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397032e3a7c---17652315499.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/nujumatax.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_212503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+share+photos+from+phone+to+pcPDF 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_off0000caa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA7 10684 bytes
SHA-256: 37056192bd8f640b8ef8e87dba351bf2662a4b191b4909cb77aec48d58a6625b
font_01_sfnt_off0000e30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 17380 bytes
SHA-256: 61c1e66759f95e1ea51f148089d6ff7029b581726d57543ba072f65af35e3348

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