Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ccadac50bbeaeff…

MALICIOUS

PDF

71.1 KB Created: 2021-09-17 21:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 812bedfde4ca06bd4fdae38f37b96d86 SHA-1: 9a71dad276782889c1e760cbc44698a948d37e49 SHA-256: 8ccadac50bbeaeff358f98011dcd58e193f3ee294e0d11e44b0cda9a47153a6d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs pointing to potentially compromised WordPress sites, suggesting an attempt to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a raw IP address in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/dc9980998ce3419d0fa32df4d9565b20/zodibawelewipaf.pdf
    • http://www.77ice.com/upload/files/rikolixoniginatezuvi.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612f882ff1647---sobisesekegejaxolexel.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438b9db64a---vuniboponanogufob.pdf
    • http://www.donboscovizag.org/images/files/wazef.pdf
    • http://upnbkk.com/file_media/file_image/file/vitig.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/23905106656.pdf
    • http://nabisori.com/userfiles/file/9067960362.pdf
    • http://aluminial.pnh.pt/js/ckfinder/userfiles/files/favamaverufubolomaxaxuta.pdf
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/perul.pdf
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/tidedebetuto.pdf
    • http://bebaldebaran.eu/userfiles/files/mofexolol.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142b6c3d0ca5---45849560227.pdf
    • https://evrenmentese.com/upload/ckfinder/files/rorimazegixa.pdf
    • http://titibbs.xyz/js/ckfinder/userfiles/files/tisunipagetapaji.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/d984cbf0d0ebfe86e7356e7482900c83/vumar.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/muzasaxut.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/88769258804.pdf
    • http://sarkar.ie/userfiles/file/79072252677.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94c375239---vililufudaworokomemixo.pdf
    • http://geopraxis.it/userfiles/files/70807722350.pdf
    • https://bnovum.hu/downloads/70407182786.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+send+file+through+messenger
    • https://www.posluh.hr/ckfinder/userfiles/files/19963080852.pdf
    • 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_off0000b78c.bin
70ae21b9cc141d2709a2ba7d7bf15f5763b58e7161e1f7ae1a6b7b939ebb6fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB78C 10816 bytes
font_01_sfnt_off0000d011.bin
49e372b56b29ec26f528cea140d149c55ccfe34bfdd724f4881af5de6a5059d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 15112 bytes
font_02_sfnt_off0000f681.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 16792 bytes

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