Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5534f45e93e58e8…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 13:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 983487a9c8ff871370ed2485edc71b84 SHA-1: 14d59a3c132fcac87d8f8b46efa3e1cc752a1fdd SHA-256: f5534f45e93e58e8d5b0e467d9a23dd5eea13222156d1456284641d571a6c876
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to redirect users to external sites, likely for malicious downloads or further exploitation. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

Heuristics 6

  • 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://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/muwigonow.pdf In PDF document text
    • https://manhalhealing.com/userfiles/file/52473672732.pdfIn PDF document text
    • http://robbes.nl/media/files/9565997940.pdfIn PDF document text
    • http://afro-safari.com/upload/files/rukudofamusasosinu.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631131503597c7f2a7bfba9e7dd.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/20859685457.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/50615230750.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fugegetonebosowufefezu.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/54129267490.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/943e060fc5e321b2a8cecc9305c540ea/jebinipejudadegidodirik.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e98fba76a---72198239405.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/93786902498.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/retuludoxif.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/57287807902.pdfIn PDF document text
    • https://svltv.in/userfiles/files/62853500990.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2e6cf2ce---gawukaxonowanewisato.pdfIn PDF document text
    • http://henca.com/files/details/file/poxekakikepijowuteti.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/ralezoleguwagoze.pdfIn PDF document text
    • http://inercial.es/uploads/files/dusufaw.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/637006c904fb6888b441d2836eaa4e23/gowoves.pdfIn PDF document text
    • http://schokofontaene.de/idata/bujumujifenamoxiguwemidi.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/welubejezupafagefifabus.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/13878505607.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/dibizafib.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/fatetu.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebfb63ffa---23995426052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=python+idle+for+android+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_off0000c0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B6 16152 bytes
SHA-256: d44982617f20343ed6bf5cd34af3f3924fc87761ce1e86f4502c02411e5933e2
font_01_sfnt_off0000eab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 10484 bytes
SHA-256: 821b770f31749d614c1f3e0427cdfd2c8b370d0d19d44be339b25e9d1190a8f1
font_02_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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