Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26bf9ecd8f8fd67…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 13:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 444bf6a260ee930920cbb1a76d5ec6d3 SHA-1: 99efa7f25effeddcce78b38e89ef11bdb6e82422 SHA-256: c26bf9ecd8f8fd67466e014ff00c845d6ccb37577d7280dfbe52c18e592e72f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=boruto+episode+166+english+sub PDF link annotation
    • http://www.radio-kum.si/data/files/dupalifir.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/39413598578.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/44461634301.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f5ecef23dd29d73584068b2d22294559/givogip.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/xubivekuvuguzunadenereso.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/senewosujave.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/danupajasafegulagoreko.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613068b0644d4---bideb.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/fisofixapafifubur.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/pagakisojigan.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109131509199069.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e8c050641---zodetoxugatujirad.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/96656272150.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613818fa8befb---fibijinigejakesabumupaxek.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7bff3fff6---53088898478.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebc6f1bc2a---28817934276.pdfIn PDF document text
    • http://ailizia.com/userfiles/10402697021.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/11932869774.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/vakesoma.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161353fec107c3---59472111160.pdfIn PDF document text
    • http://pasaru.com/upload/files/nosatomo.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///66539885965.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/797d6beeba9faaa4cdc56bde6523d602/58573348057.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/22211023990.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210903160704.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_off0000cfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD8 18952 bytes
SHA-256: fdefb606d720a03a973b877e76f633ea1c2f8f374e4b0a01e908b4c72deb7b06
font_01_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 11020 bytes
SHA-256: dbb154e6b8c8146da90650ff1465ad2ebb2c4cd436a20224633f1184133de8ef
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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