Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0530a5e89f8ff4…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea1a30ee3183f1b2348fb0585fd42ddd SHA-1: 49dccd7eb9a90fedceff4f1c868551a298097aee SHA-256: 3b0530a5e89f8ff4cbda922c1cd803c4a7695b8cf6b38c0b23367a785a715c77
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway scanning. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://krisoc.ru/uplcv?utm_term=descargar+programa+para+convertir+archivos+jpg+a+pdf PDF link annotation
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/133b1fd3f121b0b065421cfeda59f6ac/jadatefojel.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/79602823692.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ce6ba382f---35706493511.pdfIn PDF document text
    • https://kopari.hu/files/file/zejena.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ec48ca1b9cbaddc2483e1e90aea81ef9/411444349.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/telubinusenewofavo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b226046500c---38534277624.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/61995251882.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/potuguwaz.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/27342336429.pdfIn PDF document text
    • http://lyonsmcafeereunion.com/clients/a/ab/ab8eb7fa8d7cf94b91f67e7e346c80ed/File/2693779044.pdfIn PDF document text
    • https://rinducm1.com/contents//files/widivirusudadebezu.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/pozutajire.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2419e9f3e90dece91584cce169761ac4/rojiputova.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/99307678095.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/99854501289.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/cbd6b8f2a11d6e859572379dce1575e7/virefijab.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/xozekajokalejaladesariwib.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5376778e---dazojokekexugirovu.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/80299512209.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612a08f92d206---nararawutoderanololelozo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf2329edb0---fawumanirazo.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/45248224275.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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 18544 bytes
SHA-256: 56fe347f9b136af3241b0b6667383bed48db0841aacaa90396b8cd152144a4a5
font_01_sfnt_off0001124d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A64 11220 bytes
SHA-256: bcc306c96792b6847311f2c2bcdabc17ec70815a6a4975571880589863929fe6

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