Malicious PDF — malware analysis report

Static analysis result for SHA-256 436aef3abfb31c6f…

MALICIOUS

PDF

322.2 KB Created: 2021-07-23 01:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f13235e45252f6b28b38ba9832d49e4 SHA-1: 9cbbcaf53642be2a1080914f8f14096667a24605 SHA-256: 436aef3abfb31c6f87dfabd707389e8a0ec636d182b396efce267a71719059f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as a phishing trojan. It contains multiple embedded links, one of which points to a compromised WordPress site, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9801

Heuristics 5

  • 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.
  • 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://aqs-group.it/userfiles/files/68448098640.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/eb70a192bb18d86a93ad40c95120a189/5718426787.pdf
    • http://ozona.pt/wysiwygfiles/file/8109558572.pdf
    • https://acryl-bg.com/userfiles/file/65982042972.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96f850542---28984906550.pdf
    • http://beergolfers.com./blog/images/file/sukelebesegejizogoxuku.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d08db0b548ade30d6f8e2508fbc554d4/98520227886.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67a6d4853c---rugigo.pdf
    • http://vencedor.coop/images/admin/file/pajenixisaliwaba.pdf
    • https://nuttydog.hu/ckfinder/userfiles/files/gafogezetirosojefaguzo.pdf
    • http://sportsgarten.com/editorData/file/13615309239.pdf
    • http://stpeterscbs.ca/ckfinder/userfiles/files/53902485453.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c7ac85284---nanasevite.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/desifigodijalo.pdf
    • http://4seasonstours.in/userfiles/file/todiselefowulisogabepu.pdf
    • https://tidurmalam.com/contents//files/menojolewudiwokalog.pdf
    • http://nutronicltd.com/userfiles/file/javedolanawamo.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/d78f90d71e6b97c0bf10bd7ee7dbd249/86599240431.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3e1b4dc4c3d7476b1c168674eba29d67/pejixawov.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703e689206---27480678977.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a13235469c1c00a0c0e262f21f317c4c/zaxixinofodu.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0fb1109c6e7cb187b51c8b340b7ec5b6/19050391651.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/57531118348.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=cinders+of+a+lord
    • 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_off00049c3b.bin
701cab137475014d2e685591a2e5bb82074b449bc49c936e90bf5effb5e030b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49C3B 10280 bytes
font_01_sfnt_off0004b375.bin
700ad849d5af1e1c0a0d078cb68b0208e5c59e8fe0fba78c6cdca36b03dea0ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B375 17596 bytes
font_02_sfnt_off0004e22e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E22E 16792 bytes

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