Malicious PDF — malware analysis report

Static analysis result for SHA-256 1460ad1497f3eba9…

MALICIOUS

PDF

90.1 KB Created: 2021-07-22 06:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 784ab34b00372ce96b39d2b80fc3ab74 SHA-1: 60901d26045aea332ec2fa95f6fee7bdb27cac27 SHA-256: 1460ad1497f3eba9bb58e90f1eae9786306c3a50bc97213c388e745eb4e65d3e
96 Risk Score

Malware Insights

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

The ML classifier and PDF heuristics strongly indicate maliciousness. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://ambvetesopo.eu/userfiles/files/suvulef.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09b38b65e---fugopidemetewujuku.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ff5bc7eb453b277610d7013d8cd31e85/tetiripewu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dda58c0c---93251781192.pdf
    • http://whs1979.net/clients/65916/File/roveranalobobezeva.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6b957894---33139619961.pdf
    • http://jarosi.hu/files/file/839838339.pdf
    • http://jsushibrea.com/uploads/files/73112352026.pdf
    • https://atlastoursntravels.com/userfiles/file/65668280932.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14cd02a758---dogegizebaturava.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/nijegiredumorupizosij.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a66fc84e9---jukafudatexolomixaruw.pdf
    • http://ed-web.cz/userfilesfile/17622448818.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bdcde8326---40334701092.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/51fcee68fb18bf9dcdcfe2a204334b87/27634614112.pdf
    • https://sabagdasarov.ru/upload/file/46318576479.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607249b822d32---60529689909.pdf
    • https://media-get.ru/userfiles/files/gupipabiwevesoxa.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1cee8dda---76057048180.pdf
    • https://kuepancong.com/contents//files/lamaberemof.pdf
    • https://myphambambi.com/webroot/img/files/fojulusodipiz.pdf
    • https://lescourailleurs.com/upload/editor/file/puzuvex.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079cef56615e---jinizuzijovomomafoje.pdf
    • http://tizianaiberti.it/userfiles/files/wiwinatalakodita.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=5.56+armor+piercing+rounds
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 16792 bytes
font_01_sfnt_off000113bb.bin
d2a4cf7439b818c3ef8c370ee4ffaf6055f756571c852d6d36d1ad58404792bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BB 17240 bytes
font_02_sfnt_off000140ba.bin
f74eb8f81cabf2f9fdf6ad3f769c3f20b5b947bfa2c6e0d022a4ceedd01a38cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x140BA 11084 bytes