Malicious PDF — malware analysis report

Static analysis result for SHA-256 341eff84f3c5a506…

MALICIOUS

PDF

98.0 KB Created: 2021-10-06 21:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3a46842ea53fdf406369343fb91d1d55 SHA-1: d9f8de6c07f25b74e448a679b513ee207a25f28a SHA-256: 341eff84f3c5a506f9fd64bebb2da6990aeec3894071ec4e3217bb2231274e70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, low-reputation hosts, suggesting an attempt to obscure malicious activity. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://philabc.ru/uplcv?utm_term=present+participle+of+sing PDF link annotation
    • https://artesapanaderia.xyz/aym_image/files/28874255859.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/bipenibamo.pdfIn PDF document text
    • https://cf2019.codefon.hu/js/ckfinder/userfiles/files/rijujusamukixiv.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/54884180670.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/86678122506.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/fopivedi.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/nakikifadezimedit.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/binawovep.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/27370933287.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/thiq0c98dl4sg8aafc6u0q2q91/84407974597.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/givanagikakijaru.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/14158549753.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090216362287.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/mavaxojaf.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb047c7d35---rirekaboniladiruwoniwavu.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210916_DF33C2BEE7B538C1.pdfIn PDF document text
    • https://onlinendttraining.net/files/lijaritolewemisamubuwizu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1e2dba544---36119927961.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7ae4cfc3---86639409763.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/lipipopo.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/39935478841.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/23118534376.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/23124888e50b852751bc5a5167a80696/58686224149.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaea7cd352---21080454138.pdfIn PDF document text
    • http://asfalon.com/__files/file/3129046047.pdfIn PDF document text
    • http://pasted-radio.de/web/files/62487277409.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/fexitagade.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_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 22060 bytes
SHA-256: 9ebdfc51a24a3d6aaba2a31115e0e4af00274bd8cea377b78fa6e5802acca3ba
font_02_sfnt_off00014a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A24 16500 bytes
SHA-256: 0ab0cf9e53dd8aa2427fff8ca2ec4dbe456afd0c9ffc6f0857cb5f50cb703264
font_03_sfnt_off00016121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16121 10656 bytes
SHA-256: e617a7791311765686c9314f8db2226dafe71e5252f72ff33c46e3f0773a2dd9

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