Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b491f893823e983…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 03:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3b1ba2074ae5eec9fd54e712ee8ce78 SHA-1: 1a08cce9f87cb3067cc6ef7a8ae51ca59f3d8161 SHA-256: 5b491f893823e983b66c03d1f978e22ae0c611713d55d0492f7c080e3507f364
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript points to its use in exploiting PDF vulnerabilities or manipulating content to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=rick+and+morty+season+5+episode+1+watch+free PDF link annotation
    • https://deycaterers.com/ckfinder/userfiles/files/12719840373.pdfIn PDF document text
    • http://thongthien.vn/upload/files/mukubopedaropakalenedum.pdfIn PDF document text
    • https://ccichn.vn/data/upload/file/goworivowukur.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/35167264773.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/62118064574.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109050134461813.pdfIn PDF document text
    • http://www.moyekolodin.com/files/95723895373.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/keduzoforatidiposudebidox.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/909178527.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2617da7e---10878715532.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6439cdacd7b1ee44ecd8dc24c4cb2a38/gupodanuliponofoletisif.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/47256005775.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/tawalodepukojebet.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/silopegexiv.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/37512906297.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/983i5j1ua38n3eflg345m6a7s6/63609502262.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/74177838721.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/fujupewivosat.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/95405373132.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/45107880149.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/berosanazulekir.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/181125053661353a715bf17.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e5fa8eb0---72471019644.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/1027606411.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_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 18932 bytes
SHA-256: 66cb6b170b7c84b620aa5f2530f300db3f6233390c1470c150bb783547487aef
font_01_sfnt_off00011ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC6 11364 bytes
SHA-256: 5316fe30d4afcdb6de36493dfdb16f131a04af1065eccb8bbb7b5e99269043d5
font_02_sfnt_off00013590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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