Malicious PDF — malware analysis report

Static analysis result for SHA-256 680bb6ea4307f727…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 23:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9a8e00dcd54a6d5c289b76cddbc7020 SHA-1: 2b56c213d694a3b1559b4243bdeefa55e433e598 SHA-256: 680bb6ea4307f7271b5df05785c580f5d434c8def0e406a05c097e59ebab7932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms and disposable domains. This pattern suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://porfic.com/fotos/file/9373222761.pdf In PDF document text
    • http://btsoft.vn/uploads/files/17623570773.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94395117095.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p0gro59nfm2oak831mabnt7pm6/rubuja.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/vorebililuza.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de639eeb7c---menekazubadumesivogeto.pdfIn PDF document text
    • https://kokomanis.com/contents/files/dejimewev.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/34604657690.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/32169867448.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4ca23a6d69f590b9a582c70882caa4a0/letijuxavuxuguluparir.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/5465770845.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/kotomeni.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/99724734e51f0f794418919bb0581e0a/ranesunilegapu.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/xisagerumopefodaruzu.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/vewexomuribagutepaxibudem.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402635001dc---76977956656.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/19894757176.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a9111adb---vurolesuzojinel.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/87898253024.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109150559185781.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/mamef.pdfIn PDF document text
    • https://fuoriscena.eu/file/bizesawimeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+use+proxy+server+in+androidPDF 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_off0000ba36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 16228 bytes
SHA-256: 1165d38f419ef7fc467d05a5dd451cb92cd4a5f578c3ffb3acce5c41f642249f
font_01_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10800 bytes
SHA-256: 2e457c5d83f1c157f9b11b4c4d1dbfcb76b8319b21f0e16a94cb9e15d2a96c07

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