Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8602c47d1041c7…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 15:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22b7d4baa4f308d90d02588007505f57 SHA-1: e21a13aa067b4f4f3ca93d8e72c0ee0839e1a1ac SHA-256: 9b8602c47d1041c72401bcab71a35341909d9824f3b173bf56978eca11cd3581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://krisoc.ru/uplcv?utm_term=pokemon+go+cheats+download PDF link annotation
    • http://snsi.jp/image/news_file/sazimovo.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/18332511890.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d191051618---5955313757.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b707953181---48951638385.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/86732804433.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/rj1vvsmpdrtbo7ej0ugu0i6pkv/gudojadodizirerirozof.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/mirukemakurutivagusuz.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/50344574573.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/79383508260.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0b438472b---xopawogadidelimetomej.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/79999143876.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/14317175499.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/19388308791.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/mamekaji.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/wekusasenunun.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/c9d5bf63b969e594dcb5afa234b21228/pijosamowanidimoruw.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/zepupakiwa.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/jufadoxud.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/16899748721.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/zatakufubufosi.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/27928601806.pdfIn PDF document text
    • http://plusdesignwebsite.com/userfiles/file/gojizo.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/92652195807.pdfIn PDF document text
    • http://redactron.com/userfiles/file/gosiki.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/8877165190.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/wekukonokegowovimov.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 20100 bytes
SHA-256: 207939f18e24750ef1d353658517414904be0b43ff6fd03db054abf68b8f4595
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 10804 bytes
SHA-256: eeb66ba4640eb3b6f4c83133afe41f2987375944440cd914b93d1a11c28558bb
font_03_sfnt_off0001399f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399F 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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