Malicious PDF — malware analysis report

Static analysis result for SHA-256 394197f3349709c1…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 21:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 000857b233ff13f35461da9f0ca62d93 SHA-1: 4128ee94f68653ed6888d967515a1e0bf649fdb2 SHA-256: 394197f3349709c192960fceebca5856b76b1932c26920c315f08609b64055ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://mbfeed.vn/upload/files/74105617967.pdf In PDF document text
    • http://vip-cond.ru/userfiles/file/95429832403.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/78676173526.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/8939479714.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/gamuwerojimeletorekitamo.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/sinunogare.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/69764142948.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/lodowupimob.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/salabute.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134703e731d9---75309826577.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/70551115051.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/15501902430.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/bapin.pdfIn PDF document text
    • https://sanagustin.cl/files/4281604887.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/pedaxi.pdfIn PDF document text
    • https://hiroyoung.com/data/files/junapinarifewadotigin.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/60592255607.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/88235694105.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/69c51825392fa99c96f187d8d6060393/pijitedofigekuwiz.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/4e57c0778285191049ce2761a53406e1/81670793.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c42c0db39a---giginalofozo.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613192047e390---fozupovazerixur.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/83325060033.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/nusuv.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/togetelonutukimul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=pixel+live+wallpaper+2017PDF 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_off0000c296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC296 10356 bytes
SHA-256: b506ea699d8d244e6de4ed095a2299eff654c0fc5078d8978e0f33bb2f014656
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 17756 bytes
SHA-256: be0a2682f6f441e760c39e4d1c82efae44365243c9ebc52c34ced0cc590f642f
font_02_sfnt_off000107d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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