Malicious PDF — malware analysis report

Static analysis result for SHA-256 d708f2cdff2f850b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 11:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a40d7cbda4053abb3333a8499f83d19 SHA-1: 4e3f909ddcb6dc4d0a176f677a3b6de3e80a3077 SHA-256: d708f2cdff2f850ba224e7722715903e26f31fd355e8027f5674f484ddf46913
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised CMS upload storage or disposable hosting. The presence of a link farm suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=avengers+endgame+uncut+full+movie PDF link annotation
    • http://dkkarsin.pl/img/upload/files/88149870967.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/30568922759.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tulepumawuzulakajali.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613735ad4b966---tabaxig.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/59524561710.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/60162557189.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/4b35c86be451518a70ae18342093e4ca/19403384814.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/nopopivijejavikaxojugeg.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e4510f150---88222787481.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/pipuwobose.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/65828305257.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/vudilux.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab01420cb6---xirimezorewabumugiv.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210905_221610.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161393403aa45e---49851555456.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/99189552637.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/12894492651.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/bizuduvexade.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/durulib.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/xarugi.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/8848391317.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nowabifoneror.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/60741542270.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/govasopog.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/wakazowodexurozupufe.pdfIn PDF document text
    • 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_off0000df8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8C 10964 bytes
SHA-256: fe1e0793fb83b9bc389875711fc5be5d54492de8cccc6808c908a25f8b1dad71
font_01_sfnt_off0000f8d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D8 19052 bytes
SHA-256: d6f030f501a0028ed2df3cbbe43b957020966ece8a38f3664939f96c2f81515a
font_02_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1