Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c618cbb9cbedc0…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 20:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e2e4b9148f66e4702993d344c470e657 SHA-1: e8e586c2637461a4d521f51d3679c5facab32166 SHA-256: 46c618cbb9cbedc0700557f9ab2efdd2c5ccf4101b4bfd04d8d6a77873dba5b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The embedded JavaScript likely serves to execute malicious code or redirect the user, while the link farm points to multiple domains, some hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination. The presence of embedded JavaScript points to T1059.007, and the nature of the file as a document delivered via email implies T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=vietnam+war+textbook+pdf PDF link annotation
    • http://hmconcretemixingplant.ru/d/files/21529592165.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/63599699935.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5736ec27449b9cc623975ce277913da3/seloxomakepufovitoxej.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/99516164368.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/doposekewe.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/sudumeguzopogogobutozo.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/59786009637.pdfIn PDF document text
    • https://comiconfezioni.it/file/xuzutoporuvapa.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/mesomunupomekejutag.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/291520411330.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/wumagulo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/64bbd072e6da9e7cceedd9655d83034a/58947638470.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f4df8cf9f---5842141084.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8362b4c4bb1528babbdd2c04c33bbd0b/3760569222.pdfIn PDF document text
    • http://adveotec.com/img/file/29245694883.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/verete.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/detekur.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/givrf4g1gol1bjatd0str2t867/tazuzijexebudelijefo.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/47524371192.pdfIn PDF document text
    • https://whitesal.com/data/images/file/4634_20210705074306.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/tilej.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/74465902775.pdfIn PDF document text
    • https://mhreng.com/userfiles/file/zirunitexirawe.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4oslkrf9ubfi728qfo621pnnp2/rigudasiguborokasujep.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/nazibalaviparajepananoso.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608752be7b18a---64410510432.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105161852182942.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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 10836 bytes
SHA-256: 32236b5a05feb292cad73b589f8e764fbec4a6bbeb647d3e7eaa243622615c47
font_01_sfnt_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 17584 bytes
SHA-256: e6638c9e56f99409d6e8a741854b171df4346bd003130723340ef22a656975ed

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