Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5570a3df1ee67b2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 16:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0fbd4b2468ef498d277138efc701e0f SHA-1: 44a16564c81fb87b0638119e1e3f68e059d374a6 SHA-256: a5570a3df1ee67b278e3be0c47ea16a5a997a5db20fad357cac883a3d6e56113
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of JavaScript suggests an attempt to execute code, likely to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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://infrive.ru/uplcv?utm_term=cours+espagnol+pdf+debutant PDF link annotation
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c37abeebe32---31718772880.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ot7adhmoab9hvtfg2ag78ro04b/kovojaxe.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/j9l0p4adritspad10thrue3j08/6990185202.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/41044960006.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/noporoguwub.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/56004914742.pdfIn PDF document text
    • https://path.mn/userfiles/files/29420776474.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/gofiruwikatereliwajinivuz.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/fonisakubufu.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/raxazibepakatebabaze.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/3224511998.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58085360121.pdfIn PDF document text
    • https://everestart.com/images/stories/file/27496842376.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/64486259674.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/85493614484.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/marirerogazijabe.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/losan.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd8f3b3713---pumenitaluzuk.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2050b575---23519084935.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/78942956382.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bceab1842b4---44540076372.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/25058390117.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/45131923679.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_off0000dd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD59 10852 bytes
SHA-256: 6ffd97797b46bf568192397dfd31ce909b4341f454cf1ec60745769b7e5169ce
font_01_sfnt_off0000f62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62A 20156 bytes
SHA-256: b85bcbaff2186ecee02750c25b766b022694841b69e04776edc84e6f211542c8
font_02_sfnt_off000128e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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