Malicious PDF — malware analysis report

Static analysis result for SHA-256 4864b23afa0dd0ba…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 09:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ac4d699544f6c37e630fca2252c7b438 SHA-1: 96779c0d630a668f049dfd3e9823eda3f1d90837 SHA-256: 4864b23afa0dd0bab38aca9679a639d1625b432428a0cd0982bbd0ef74440fdf
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 CMS uploads 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 malware distribution. The embedded JavaScript is a common technique for executing malicious code or initiating downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://coretry.ru/uplcv?utm_term=best+simulation+games+for+android+offline PDF link annotation
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/fajomumejaxetejezikenute.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138938b22469---17491273420.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/40177899156.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210913130510_wlkx7d.pdfIn PDF document text
    • https://adikketiga.com/contents/files/jozajif.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///39443192759.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/juveme.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/xutanazi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qtjfbhe2u4an3a0q9u7vus0qs2/kufekabemuvifafilafig.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/19121922626.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/rawulowaluvafoxafirasimeb.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/95505998175.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/sitemugidelubefa.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/tonawodazezezadovul.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1de8083be---xusukip.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/keniz.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/89824605249.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/34472930411.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109062138223853.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/3144765967.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/pumuponemonemonotasakuxot.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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10848 bytes
SHA-256: 68974cdb371dd3622cadfb356376435c33a90874155349ae0d05cc7bb0eaf5f2
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16468 bytes
SHA-256: 9d7f314f6ccf0c8edc38cf854cdc1006fa2152b2cbc54384e72ce3ba3db6f849
font_02_sfnt_off00012354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1