Malicious PDF — malware analysis report

Static analysis result for SHA-256 da399d50e4777222…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 22:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8b8246aaa2b7637c5519f7dfc1fd3bd1 SHA-1: 5eeb3eed2d85dad225b8a64321d5439b4ab12498 SHA-256: da399d50e4777222b1ee3ad7072fe6edb35e20965ac2b613551b38bb5c70295c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4cqv2ppii05f9n02rbu7456em6/44057734928.pdf In PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/329619adf4384ee2061be089c4ce0f01/suxijenakuxanej.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/gabovosegitet.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607620ac83e6a---46658265703.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/jipebotiwazedo.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59ce42cb5---fisorodotikominatixupaten.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-13/20210813000950472031.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/027382e9c41e9ea6f697af8313b5af2c/zizolupidukoxajaniwexiz.pdfIn PDF document text
    • http://amdind.com/userfiles/file/36349766812.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/780afc69633e6b0969845f27bc47953a/8589358491.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/bebibonexabanukapal.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210730182617188074er0blmt5h4jz.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c990055bf7---fisidufepikugumubiwegapa.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210723/0053414485.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/hu9d07gcslujtlrtjkc288qb83/fafavozimazoto.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/36a6d8d83b0648d7368958103dbd8485/kinarowipoxaza.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/111136046249.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/xemuwunitepexafesejapuze.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/f9e3a3a54ba2a40ee0b27faa8f55f599/50610375234.pdfIn PDF document text
    • http://euforbiabulgaria.com/uploads/pages/files/fubifotazukelidi.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/94828571430.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/wimegupipenesivinuvira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=leadership+part+ii+developing+your+leadership+skills+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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 17264 bytes
SHA-256: 7e9e841cd99a07e14fb8e79de48f491beff2b211bf8326c6a5dd01fe58a641ec
font_01_sfnt_off0001076a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076A 11104 bytes
SHA-256: 69b5968ac5714bc6c686144ff2db38faa695eae98403336087ac167361335461
font_02_sfnt_off0001210d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.