Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c66c91383acb7d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-17 08:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9f1e821a594429a6050a5e2ccbc0350 SHA-1: fa9c03f5283fc86a4c32065920f205693d4a7988 SHA-256: 04c66c91383acb7d083a27fe3d8a894930e695f5524b0041c496589b09f9bcda
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 websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://pixomot.ru/uplcv?utm_term=how+to+share+location+android+to+iphone PDF link annotation
    • http://otczenacts.com/media/files/9214284188.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/lesilanubalexi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379b463c789---44125691933.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/88005917707.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/kenoxilitadabil.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/88109992873.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/74089157138.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161321da8ad7ac---35925950987.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/tatomurabe.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/lujijegutumebakemid.pdfIn PDF document text
    • http://arsvet.ru/img/upload/35887173061.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/bawuvumaxenidedaj.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17205528396.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/mazejagisati.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/73881569799.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/59184542948.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/kuxumiwelaporodatevugap.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/64749668411.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/subalepalimevonizujew.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/xiruvakiwemolimofux.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/13408320456.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/karabep.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143edbe41c9b---8044356828.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369a3b312b8---vatuzakamabeta.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/mirixari.pdfIn PDF document text
    • http://gardatrans.com/content/Files/xanenajeduvefawizomoxuru.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/59631931476.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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 17260 bytes
SHA-256: ab5251277efa86d3f6f6f04aed5387bb0b86d7301b527564805282f6cf13c3bd
font_02_sfnt_off00011c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C43 10688 bytes
SHA-256: ce396e6f6b6d187c3a4d47bc31e9027030794ddfc4623466b0c9fbacc7585bc0

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