Malicious PDF — malware analysis report

Static analysis result for SHA-256 915a77353a46158e…

MALICIOUS

PDF

74.0 KB Created: 2021-09-21 01:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 156e9a9f59b55c270fa2067f850f3740 SHA-1: 1f10b44b36aa233cabe0953e98d777a6725f36ce SHA-256: 915a77353a46158e2d7baac3f7c62e19eba067cb03da30c8398941ee6fcaef1d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of 'utm_term' parameters in URLs indicate a tactic to disguise malicious links as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=save+game+collection+gta+sa+android PDF link annotation
    • https://denizlihorozu.com/resimler/files/ripanonafazaxeb.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/sovaxuriterozimut.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c115b08765---kagibuwobodamifovige.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/vuvetefapetowezexesamore.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/5265554173.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210919_041758.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210906230112_247615173.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/wopuful.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/wugivu.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021091016312988966.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/bukedike.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/bivel.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/perogana.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/79243130001.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/99855565796.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/64662721418.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144cedf5c793---pefelojoje.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/tezudovemek.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29c2e7150a2693ccf2ec63a6a67af6c4/jujifawovikazuwitidagitun.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/nijamifokovuwowiru.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/89932792914.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54784074328.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/89060295570.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/tetubutagagazalaxel.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_off0000bd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 10852 bytes
SHA-256: cd5195fcd72ae706bd7cf2b44eeef5007b0d0277979024defef66d55b73ea6ba
font_02_sfnt_off0000ee64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE64 16940 bytes
SHA-256: be7bea0dc6fcc6dc7ab4685f8414a7c0d15b0f70d55703112eb89c3a677b5046

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