Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b74774cec3b660a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 13:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11730fbeb37e0a40a742946af53b46e6 SHA-1: 6d40f0197ff93daece87e470cbb1f38173759621 SHA-256: 1b74774cec3b660a344899c10ec85ca33e15c8a66748a0440c556bc43709d8e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics, including a critical ClamAV detection for a phishing trojan. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting domains, forming a link farm. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=a+quiet+place+release+date+2021 PDF link annotation
    • https://nusantarabet4d1.com/contents/files/55087100044.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/75425057103.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/92616143213.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/zujapasudaduzewesu.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/44385816494.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3c3f5f570---tigud.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9a2ef0ab---jotifavadatomipatudixaz.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210909190113_383289355.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/runulofukimixigakaf.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/tonugerewofixikokol.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/mubim.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/zimudogoveli.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/morofagurajusiw.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/tudikugijutirojufije.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138b8842a0cd---94972190085.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613011825fe3d---buguludasapelogorufa.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h8c4kbj4rehh28oo7ul7ncsoq4/25936787966.pdfIn PDF document text
    • https://geloracinta.com/contents/files/jegulavizi.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/32936789341.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/supafolezigijuwisinejepog.pdfIn PDF document text
    • http://atrsara.ir/resource/files/pinurepo.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/58309666827.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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 17444 bytes
SHA-256: 53ee42ab77b40acc60f2b6a3090f7623b1ec4330394c4a5c28aef7b8bba848b7
font_02_sfnt_off0001272f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272F 10804 bytes
SHA-256: 5b8b36c2429989552c74067de6add87f0f826b11402d383ab0e9c2bc928de3b6

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