Malicious PDF — malware analysis report

Static analysis result for SHA-256 90855dcd5599dd30…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 02:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e25231695b3bfc5052bf0f0fa877dae9 SHA-1: 74b6f875c70d4220f836156bae3470879e06ecf8 SHA-256: 90855dcd5599dd306109f9d3471a4d317ee8589ec458fa4aff760f65d59377e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://hosrem.org.vn/ckfinder/userfiles/files/pikoleb.pdf In PDF document text
    • http://cnokorea.com/userfiles/file/84223385265.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/rombuls8is3sr5q3lute5lh7hh/nakekovazibovipegudimeno.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/56926283107.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/lowaxireximezerewid.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e11c085692---vejodakaxulabasizitolol.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/1853a55f7622368763ebd5bea779c261/15061410766.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/54057970699.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/vusubukibosenesole.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/xomilubibelakipesibe.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/12d6f5e2d4284e922f2a649ef4714a57/kijuravutatatokusez.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/54862047944.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/85376683345.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/40701417077.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/t9duc094foogvsd3bt89a1qq0a/somipel.pdfIn PDF document text
    • http://palami.by/images/file/jigegozuduzi.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lipipubomixagifavasad.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/04a9a34a1da91f6221bc220302b013b5/70406345313.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/tigotedemewotafigodatan.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25545a61bd---3741622681.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/namekojekosixepejafiv.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/0atf7u2c9v2q7tql1k7h4pfaun/fadolo.pdfIn PDF document text
    • http://jump360.co/upload/files/20210707054215.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/lifusajore.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b1c06921aaaed5b899d24fbb05fbc039/21556650667.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/7958176072.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18c230a4b1---xopuzipusifap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=jaringan+pada+hewan+pdfPDF 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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 15788 bytes
SHA-256: e91a602e8a5952a08f0ef8ebb5fccbc58094ea6ece2a98b7145dcbab5251df38
font_01_sfnt_off0001006a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11881 10424 bytes
SHA-256: 8ed087301d19d485b3183056c11ca79bf7a1a42bcbf868b930f613b735e81531

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