Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e28a0df95bb7a3…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 02:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c8f1860aba2b1805123e0734f507464d SHA-1: 3a4c7a7a69d799b162630977fdfd4bbf2a7cd6a4 SHA-256: d4e28a0df95bb7a33d8b71ff26103e16b3770b919953b8efbc75a16b6124ea6b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a phishing or trojan attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to solicit sensitive recovery secrets or private keys from the user. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing lure designed to harvest credentials or recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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 http://najlepsietorty.sk/uploads/fck/file/12045809709.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161465eb90b9f6---wifevu.pdfIn PDF document text
    • http://only-svet.ru/upload/files/26718809343.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/tapova.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/nabeselakasuxowedif.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/muzaporofekuda.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/40197536555.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/ribekamijabituduruleweva.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/gifukazotorut.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/rorawupebamosugowuvuwuziv.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d0f4d9bca---jikomibujagurafukala.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/77874142797.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/kefititanim.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210911041524.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/jelotabefewamunej.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/sozagig.pdfIn PDF document text
    • http://lejuriste.ru/files/file/68239509868.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/36367830724.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/weweja.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/saduredovetuwure.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/bifitasiralote.pdfIn PDF document text
    • https://etadelloro.it/images/file/difisigon.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7ccmchk9i5vfu0tro5mnolkqc2/pamesikopigejupusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=limitless+jim+kwik+pdf+download+freePDF link annotation
    • 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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF369 10924 bytes
SHA-256: 24cd7c22685303b8103ba8a325eb5867d80573434d15d1ab6e8d38821a5837bd
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 17272 bytes
SHA-256: d6be5c6b834e98350237200cf6ce8e67bfc1f0cacbd4c052d6f9d1cfd6cdb37c

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