Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc26bb516b662c51…

MALICIOUS

PDF

93.7 KB Created: 2021-09-10 23:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b0c9dfc0f3f7c2f89438f0c4817a6e8 SHA-1: 6eb86dba72a7e332d702a3afdd9da7e60b79c547 SHA-256: bc26bb516b662c51637b5f055942d40ca14c4cd1f8f4192a3e1b8d07c2c2de6a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ML classifier strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://oniceh.ru/uplcv?utm_term=epidemiologic+research+principles+and+quantitative+methods+pdf PDF link annotation
    • https://xedulichhaiphong.vn/images/news/files/zopasosipejokepawovuz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132692452c10---67651318720.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/lekududusukenojotavepobo.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/7396813348.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/kozusifafiwafiga.pdfIn PDF document text
    • http://darstin.com/userfiles/files/wodanobotezivabela.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/7260469449.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134e72722e54---duduge.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/42750470088.pdfIn PDF document text
    • http://houselandia.ru/files/56360607682.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7627e09e7---40114945588.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c56c8ab7e03dd7fdfe3d63f76ff5b437/30319835223.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132189ec0ffb---95496218900.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/82448712402.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/74810557035.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f81a915a2eabf4e2f61868eb2396bf63/sabav.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/zejozefitowororo.pdfIn PDF document text
    • https://krossi.ru/images/content/files/renijokiwifelanajag.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/80991942755.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/59066327190.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/jewebo.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/dedusupekalevisidug.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/70780414192.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33afa1e8ba79600c02aaa4bec15003ef/81922783476.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6fb8a7081a7dd02c7085f2e12a4dd4dc/68367330502.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/kigevufojezinixoput.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_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 18488 bytes
SHA-256: 64dee2b981969b583a74dd6c57e74d47127678fea70276082aa6d46dd6b0706d
font_02_sfnt_off00014e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E53 11364 bytes
SHA-256: 6e5eb3881448dc47583e31caef7e2bba580d0a5df6cbce3f9c4525785d721aec

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