Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66a0957dff684ef…

MALICIOUS

PDF

75.4 KB Created: 2021-09-10 17:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f19cfa8981178870c851551606ec1417 SHA-1: 582af4eb78a6177a02b134736c94cd3045e3ebfc SHA-256: e66a0957dff684ef4640f8649453dcf04cae6a988a68b09f1f0165140fb0cf03
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, pointing to multiple domains, including compromised WordPress sites and disposable hosting. The presence of numerous URLs, many associated with file uploads, suggests an intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://melz-feu.ru/upload/rebiwefekezunovuwameviwik.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/4b4f88367469dcfc34a8a3e63975e869/vuxepuli.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xavozaleximelugenaxuv.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090512090973499.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/74638122512.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/31717805009.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/rotenuva.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/56937354401.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec353325d5---gigavopemisivegopanojuze.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/67564791607.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/lusakolodamurisoke.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/sufikur.pdfIn PDF document text
    • https://parkettworld.com/upload/files/33945485189.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/58193440350.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/13199803815.pdfIn PDF document text
    • http://noclegsosnowiec.pl/eurostyl/photos/file/30232176279.pdfIn PDF document text
    • http://net-work.cz/data/file/xupolumalirikesefari.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109061325084147.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/58751643039.pdfIn PDF document text
    • https://basisnomor.com/contents/files/mapovalefufa.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/soguxoronavolifuximu.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/71aa1b4f8c0ffb6f66c0e42f0ca30cd8/lipawevojakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=custom+rom+for+samsung+m30sPDF 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_off0000c2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E0 17300 bytes
SHA-256: 2bc6cdf8f96faa8da2d9789d42e48e4f426c8e3469cddd1ec5d2bbda4e167300
font_01_sfnt_off0000ef6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 10712 bytes
SHA-256: dc1723eae658d811dcb37a855be7d946b775195049a46262cddfc83203867cba