Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd279f5d2c3e43e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 11:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4076e86ad8347ef308524a448284e3be SHA-1: 705598615216bf85bedac3af8f3267d9e13aa038 SHA-256: 6fd279f5d2c3e43e5c2dee0978155fbe65cb2375ac07eab9819a89ee380a719f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these redirect links. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/41154162254.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607799312ea4d---mazasawisevebu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/tinefuvojib.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/fogemejonuremolumotad.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ef637fc1bd1300d35f09d67a38873b4a/34873064261.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090abed50e0d---15967275814.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/rijogenijiroxune.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/geriw.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/vuvuxomoxijulem.pdfIn PDF document text
    • http://thongthien.vn/upload/files/4183444583.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/7i9vdsrkupftkb8ru7tlmqhku3/84936535929.pdfIn PDF document text
    • http://ccspevents.com/clients/24998/File/83395732618.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/xadim.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/88018637640.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/2ab3799812000ab63c207e43eacf72d9/dizudirozimiresez.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kodezotobotemawezax.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/besuz.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/roruli.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zomeguwifuxitikokubofif.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/mdrlh3c6cqds8vvoa0usn5dq9t/77352175172.pdfIn PDF document text
    • http://peoplefoster.com/pliki/15262186075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pharmacology+for+nurses+a+pathophysiologic+approach+5th+edition+pdf+downloadPDF 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_off0000d0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DB 11500 bytes
SHA-256: 862bb3bfafa7e623d07f99b10168eb96c4a2f951a41d02914db7b993c9215cc3
font_01_sfnt_off0000ebd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD7 18284 bytes
SHA-256: ef73e2d660fd3e4e7c9f9001393bdb17c666bcc59ebe1888e68ebb01f006248c
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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