Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a9611f1c209a10…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 02:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8538bfc6229ff0467deb504bc1ac9ec6 SHA-1: 3c1690b85ad390c46965b0477e7ff00adf923161 SHA-256: 62a9611f1c209a10feca5443d6a1e7cc50fe78f1df74d31b941f71dfdcec6b19
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 0.9978

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://indago-rovigo.it/userfiles/files/75348386427.pdf In PDF document text
    • http://hydrogears.com/survey/userfiles/files/84509165077.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/78917044069.pdfIn PDF document text
    • http://pinxedien.net/upload/files/34945180215.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210718103738.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/wubudunonugixisilutisesa.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/29003627834.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/77199810022.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/61086557358.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/8cq8i0e6j1puhoug59fhv73itr/96204690458.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da02d5d8c7---xotibo.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/4647656559.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/37664496583.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4bb5d591d1b947d3fb767f0d9b13d8e9/rigowamelijojeme.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/mimov.pdfIn PDF document text
    • https://castel.ro/userfiles/file/34019919608.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/36912182506.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/viximiwa.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160738bcc31537---litumebupoga.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/dbf5543f3b6d16f85a1dc5481571e5e1/17761043712.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e3tib2olm39ss0cb2vtm741qn/vofiwoliwop.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/39582663574.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/92584318843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wicked+4+letter+wordsPDF 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_off0000b5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D3 15240 bytes
SHA-256: de439299ace1dee52d2a65440a865cf850576f6ee815945eec97d3c6a1b72d6a
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10344 bytes
SHA-256: bd76ecce91471518fff2bd32c2cf1bbdfaad09cbeb3056b01949b700d5223c78
font_02_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1