Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6e17a981b6c496f…

MALICIOUS

PDF

71.1 KB Created: 2021-10-04 05:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2b3fdd94b4885b26d56de38df49db4d SHA-1: 4400b7fe313448cbabd0b74ddfe1f9cfcc002949 SHA-256: f6e17a981b6c496f87350da97e4a984f7f57abdae772f5b4af2d9b7ee7b34b28
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or are part of a link farm. The ML classifier also flagged this PDF as malicious with high confidence. These indicators suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://catamma.ru/uplcv?utm_term=advanced+excel+exam+questions+and+answers
    • http://profitoolinfo.ru/ckfinder/userfiles/files/6234215736.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210918092121.pdf
    • http://oletrans.sk/editor_uploads/files/92777264708.pdf
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/lumep.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/belagowokefuzajolet.pdf
    • https://kede.org/userfiles/file/toxitataperoxa.pdf
    • http://changrung.com/ckfinder/userfiles/files/nudejemutor.pdf
    • http://jplus-ag.com/upload/files/BodyFile__6145564F75950.pdf
    • http://grimastone.ru/files/neradusanezisuxeboxuvi.pdf
    • http://japan-railpass.info/images/blog/file/14368360254.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c01d1d6633---35261292775.pdf
    • http://alrabbanoilandgas.com/file/files/dojakaxijowakewuwopus.pdf
    • http://z-sinpro.com/upload/files/95360339804.pdf
    • https://bravo-hk.com/userfiles/file/fafodaripetoxatawux.pdf
    • https://www.delaneyllc.com/ckfinder/userfiles/files/30756289151.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/mupasaworov.pdf
    • http://massintech.ru/img/outer/files/wunetezis.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e7be4b5e5---dofawolowe.pdf
    • http://dayou.tw/uploadpic/files/202110021644337015.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136656189ea0---43653825673.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387292d402c---begesedipikifepapokatam.pdf
    • http://a-xian-coat.com/uploads/files/202109100623473064.pdf
    • http://g-shocktou.com/user_file/file/lukemiwanalopegi.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161497278b68f6---pedik.pdf
    • http://yachtandgulet.com/userfiles/file/jisemimaj.pdf
    • https://peterdegendt.be/file/xexufabusosomulote.pdf
    • 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_off0000b370.bin
9c1c8b10b66ca63cfa158700059731e758d3d0b05874b48572a09d88745895e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB370 11012 bytes
font_01_sfnt_off0000ccf0.bin
727bb6287e26a4277c89d22e3e670952da83aa056eb6e778657b87e3de468641		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF0 16344 bytes
font_02_sfnt_off0000f681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 16792 bytes

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