Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff592e110a5ac9c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 16:05:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b58a9d88f21df6a050b13227bcc46353 SHA-1: df3caef2dcd9350a86c2be135031a32c31951895 SHA-256: dff592e110a5ac9c724b50264e39526b9404d685ea5c02a40553ce4297a72925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and link farm structure strongly suggest the primary goal is to redirect users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139975f75994---51650318127.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140134aee69f---29028552791.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/92115390065.pdfIn PDF document text
    • http://krzeptowski.pl/file/zusopaxanawilekusakajugu.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/xalud.pdfIn PDF document text
    • http://cudicio.it/images/file/32740193612.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0710525f---mululevejoxukusumerebaso.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/xulunag.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/fotefofinug.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/puvukowu.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/52581332212.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/49248950874.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/xalub.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/15410128853.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/rinobikuzotovimat.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/40369775655.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b99c6fb0---69474850882.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191613825336.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/rutagaxejerenoku.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/gefez.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/41520477643.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/sezejiwufexewewigiwebabo.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/64033758537.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/93949930922.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4ccc3e11a3f5c0762c1a782584d1af53/dimutejikamazuvagume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=akira+manga+volume+1+pdfPDF 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_off0000e153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE153 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 10864 bytes
SHA-256: 839728325318cf8e74e88cbf8696dfb83c97c6a67245000ad0ae3aac8dad37ee
font_02_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 17756 bytes
SHA-256: 54ffa97d4d39f260653ed579e296fe31043269d7ea37f6a3a363d22defafbfed

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