Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2adc8cf3545102…

MALICIOUS

PDF

86.0 KB Created: 2021-09-04 02:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b28a962f19b24cc3c19e32daa2d083f4 SHA-1: 03413428c56a0e734093209480c386ef8c53226c SHA-256: eb2adc8cf35451023eecf9af99fec37efe71771634667fbaecb4b62bba50c369
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple PDF link farm heuristics supports this assessment. No scripts were extracted, and the document body was unreadable, but the overall structure and URL distribution suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 5

  • 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://777mto.org/contents/files/lotoxixesijezowi.pdf In PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/wunavefipowuniseganufow.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/da411baaa5337d01db16028886e60741/93770849838.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/baranafekezukalezonisop.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/99899630227.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ca66e833877725683d4301436c611c3/64170231939.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071372a63ab5---5884223477.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/9080937277.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/862ad63f1b8ce99225872397fa999c04/fororoxafebuwojokupukerif.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/26132189254.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618090909698892235.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/watufawaf.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92febaa09---34018365241.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/9c9a6570dd3dcfb09bab4867dee51aa4/9525994562.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112a0f39d8b9---41953614561.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/96350727968.pdfIn PDF document text
    • http://absigorta.com/E/file/4837904493.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/11bf91ef63e05668554908ced147abee/fajexisix.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/39905164454.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/93901503258.pdfIn PDF document text
    • https://kamedia.vn/data/file/88698579739.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/zudofuxosomesolulalikumi.pdfIn PDF document text
    • http://rayanchem.com/d/files/domilejonakozunibifej.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/rekifelobip.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a94d6e8fc68d873708edd4d90b1b9d95/84431121469.pdfIn PDF document text
    • https://masihpt1.com/contents//files/kelepupej.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/33473524876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=basic+counselling+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_off0000ed58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED58 16816 bytes
SHA-256: 4545bb3f897695c6dbc819b18065bfc400d81ad4b4ef0a44710f675e8527b2ca
font_01_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 10840 bytes
SHA-256: ff74263fb706aff482a983052671f9ecf01d4ea518f08500d98d23593c2847f1
font_02_sfnt_off00013194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1