Malicious PDF — malware analysis report

Static analysis result for SHA-256 20d09da0209adeb0…

MALICIOUS

PDF

94.6 KB Created: 2021-08-15 00:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 923e1a92835871a4648f6dd90e37359a SHA-1: 1775ef98a51f4e79d442a1ff98cdcb7088e4ffe9 SHA-256: 20d09da0209adeb0e065447b10b39551e61b78512cc60c25cc70693004336b15
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=inhibidores+enzimaticos+irreversibles+ejemplos
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb50223f27---wapojetojomevobi.pdf
    • http://apsencollege.org/test/fckeditor/file/gabige.pdf
    • http://tahi.hu/ckfinder/userfiles/files/64162873785.pdf
    • http://nova-auto.com/upload/keromobitud.pdf
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/42930326722.pdf
    • http://iraneto.com/basefile/iranetocom/files/60460388078.pdf
    • http://ubest.ru/images/file/josorabekokurumexapumanif.pdf
    • http://patokapugsnkisses.com/clients/61143/File/45038607245.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5168a46225---fujumuxinebutevusoxikaf.pdf
    • http://hayatteknoloji.com/webimage/file/ganakijofezupofasid.pdf
    • http://elitaliaweb.it/upload/file/8036184883.pdf
    • https://hankilfood.com/upfile/files/5101387394.pdf
    • http://yanarfabrics.com/firma/files/gefusa.pdf
    • http://w-f-l.de/user_img/file/rafevaxadiranuguporela.pdf
    • https://mecaniquekd.ca/upload/file/79876587789.pdf
    • https://aynispirit.nl/userfiles/file/28453491111.pdf
    • https://syntellect.ru/Repository/file/nenerozedareruri.pdf
    • http://skncn.com/u/files/32357239672.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609891c34978e---gomejaviki.pdf
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/xafim.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pcipaupog4p1pmvb7q13fh9ln7/fabajunubujul.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/b5ff8440fdaab13038ad45b92acd99dd/fasikugoguwibabaw.pdf
    • https://clubsportedinburgh.org/userfiles/files/43994965815.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ac4.bin
d7cddb7608914e147469d5861e45e838f1ffbcd780be5fb4c587ead8a95778be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 11124 bytes
font_01_sfnt_off00012443.bin
ef0b0424269d4b343d9654c00b01ac62263bfa9e71d31b63f22c0ea86365b615
pdf-font-stream PDF embedded font (sfnt) at offset 0x12443 18260 bytes
font_02_sfnt_off000152ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x152AB 16792 bytes