Malicious PDF — malware analysis report

Static analysis result for SHA-256 79737c5668f32fe9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 08:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa2d9ce1f9dcee3c76d169ee9200e8f1 SHA-1: 186e28219240e685d1ae80b1871389201dd89e5c SHA-256: 79737c5668f32fe9e18cc818abe8e36ceb716db5852cb50a1732a34b00297df7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to phishing or malware sites. The presence of multiple external URIs and link farms strongly supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tahyuh.com/uploads/files/202109100400001301.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463ac76cdc6---2157027766.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4179a1c25b2579739942bb756e57b6fe/76159573448.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/26379178620.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135dd6777127---pemexomekegipoxowepixa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/1aefae698c79d099de2be9d7eb5bb7c8/27581172934.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/jigutifupafelegot.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210905022513.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/guvifolotukag.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630713502325094450.pdfIn PDF document text
    • http://sergeybazarov.ru/file/jisodibulojafi.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/wewefotalurebazag.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/biraxikujaluwuse.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b76fd610c---20535416486.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/48562822658.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210921043508.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/4869388924.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/30956772644.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/30908349088.pdfIn PDF document text
    • http://mq-water.net/upload/78340676421.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/pofifirenotade.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/savoporaka.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/37609059316.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613400903a9ec---tujolesafewawow.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/43712040973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=view+private+instagram+account+without+followingPDF 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_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 11148 bytes
SHA-256: df8e87699869ab29d5962ca8949d8367a458c5936c45f508256d92497392ec96
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 18276 bytes
SHA-256: d6b34f2f85eb2655b20aeb6d41bc59be75b2699e72e38968f6019c46c367d16a
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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