Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebbf8b061e3ce1b5…

MALICIOUS

PDF

91.4 KB Created: 2021-08-01 13:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8ecdaaa890404e4244c298bab16da72b SHA-1: b6a259a37eaa5019ee1df39d320f86cd4b353e9c SHA-256: ebbf8b061e3ce1b5213d98440edd4fd745c32d2e20cb6c122b02c87d45cccee0
244 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a 'download button' lure and explicitly instructs the user to disable security software, suggesting an attempt to trick the user into downloading a secondary payload. The numerous embedded URLs pointing to compromised WordPress sites and disposable hosting further support this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=age+of+empires+ii+hd+edition+5.8+download PDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/c1rant23aspbs3kt4getjsgikr/50419098867.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/96594063923.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160787fe3c9122---nuradu.pdfIn PDF document text
    • http://calzaturificiocatia.it/userfiles/files/pojadodomizemuwipovos.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f6c1aa2037c05e37128d8098c2ee9ff7/navubekamumojipumipi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/8027473630.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/24234671205.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160804ccc3f96e---sopeliz.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mugunigap.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/69096930956.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/36gfltrgkrnqcddmd7ptonccva/6816242011.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5d12b22a438f6ca14cbaa3399cb75e0a/38047789347.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4e25a8e5348821f4b23ba89e98e7df08/pozijopolisizamowofab.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sisefonolifi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f7f80179f310971761f658c5855b61f9/51850429311.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/dawiw.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/flmj3c508tcpvtr932kn0rvnn6/deruvegimakajole.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ef0dbff13---vakeri.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0f1a61e5ed834c3d7ba41f3f986fd5d8/74251316116.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e4bba3f2b---mazuvido.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b3d48dcec---70564865998.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b81719f2e---fupilunibolupivumisufexu.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8db789f9dde3ffd561da781137bde2e9/fadidapidoxe.pdfIn PDF document text
    • 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_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001129e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129E 19168 bytes
SHA-256: a1d91747474c75f9e7e83892aa4af8cbcd6a28b6030b0c84ad3ce87269f8d61b
font_02_sfnt_off000143fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143FC 11420 bytes
SHA-256: 857f59404b42bf61ebee428bb80d1fa95f10fbe2ed91e14b6e4f7ab253911d2c

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