Malicious PDF — malware analysis report

Static analysis result for SHA-256 e628c8b3a9e33088…

MALICIOUS

PDF

92.2 KB Created: 2021-07-13 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9483be3411dadc1c45b9783f7d0c1aa SHA-1: caa952c2d31c859f86ddd25d7448c577c7f63c32 SHA-256: e628c8b3a9e330887dccc2abb0a484dbf54667f35ed6ea6cf2e2b406b2b54f1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://www.knickmeier.net/images/pageimg/file/41473156724.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d37d71825ec---20476189121.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa2090036---pafabunu.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160be948b64e5d---52373785813.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24a5a938a1---xemopixutixu.pdf
    • http://thailaundry.com/imgUpload/files/xiluziso.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/8912bef0fcce2fd272b1cadb30342871/bivino.pdf
    • https://transit-connection.com/userfiles/files/70264015298.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706dac8d67c---gonomoweredelefujiri.pdf
    • http://lasfyy.com/uploadfile/file/20210629093729987.pdf
    • http://ilkyoukais.com/Images/Media/files/vezadozujutumawosu.pdf
    • https://stiff.pl/ckfinder/userfiles/files/jobidoxalug.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cm9vjn14kodgoi5gkc8c04kav5/fazivoxikel.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/59o3d2e8vvjndhh4dsjv56t98n/femusiperibokid.pdf
    • https://binarbaid.com/public_html/userfiles/file/romiburebonosavax.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8619f04597f0a1b809bef0872ae19e6a/16007123960.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/b173581ddd540a0603f7b32059b3a006/xokixigavewuvixuf.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ec9d1b9bc75---samug.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8pp8kka7ajlqd6lfi6q6hl0l00/46537859338.pdf
    • http://sgd42.ru/userfiles/file/66825613232.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8471ece1d---retilujimevituw.pdf
    • https://siahotel.com/userfiles/files/zilobexu.pdf
    • http://thucphamchucnangmy.vn/uploads/files/nuxozenejumaneji.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/77e26280e74efffcb161d05905a09c47/lujudiwik.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0aaa53493---74570570758.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=equity+and+commodity+trading
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010458.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 16792 bytes
font_01_sfnt_off00011c6f.bin
d00030c1f0bd600bd8f5720c8cd3c6604e168e8dd8775dc49a94537a2332b93c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 10712 bytes
font_02_sfnt_off00013478.bin
b4817575d06d4ba66dc4553a5925107cddbbf1ae6fd1ccc2080be3cd8ea330d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 17744 bytes

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