Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8305d519b07103…

MALICIOUS

PDF

71.0 KB Created: 2021-10-02 11:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cd5e17940f995cc4b259a361f4caae0a SHA-1: 6cf6c10aaaf854c2072ec166f39f76d4365c215c SHA-256: da8305d519b07103d7ac9b3d0fce5190eb68cb069123b5ec60548fce79a5a925
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to potentially compromised websites, including a WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=meaning+of+smirk PDF link annotation
    • http://webmba.fr/client/logo/file/79496956762.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/38433854596.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/kogutumum.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/23481463731.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/66235568176.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tipikatotibevib.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9d0b61ac---dapovanidogebimiza.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/5248939570.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/36553188955.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161505202eb228---nazamawegitamenugekepan.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/sesiru.pdfIn PDF document text
    • https://jagominum.com/contents/files/50904106533.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/17520634216.pdfIn PDF document text
    • http://med-os.com/user_upload/file/93448034177.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/53150488811.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f54163ee4---81592630220.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/28144245878.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/ponefakakapevumu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/tevifurufutururirewe.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/munibovewilarokigitotuno.pdfIn PDF document text
    • https://safetyhanoi.baohohoanglong.com/userfiles/file/43895988826.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/18113018250.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/ziseruloxajirosebijuxopi.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/lapebinukawupilunimizejes.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_off0000b128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 10500 bytes
SHA-256: 1c5acfd43855e690eaeda9a1e854fe6068cc376362e48a57c20364898f9da59a
font_02_sfnt_off0000e117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE117 18092 bytes
SHA-256: 1295a23658669d379c0b534c2e4aff834ac99577e34e118d0e5a268798cecf98

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