Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a58cb8191a012dd…

MALICIOUS

PDF

68.1 KB Created: 2021-09-25 08:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32d79b06a579a320df280818fc3169b9 SHA-1: a3597139229fce533e90b68026874c1124633aeb SHA-256: 1a58cb8191a012dd384171ed67e5323f0a0b5989e62ed5d017ee10f90620befd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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.
  • 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://msiutilities.net/documents/98860406214.pdf
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/didox.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c43409ccd---nigipawogowisiwofisev.pdf
    • https://zlatartopalovic.rs/files/jiwumenajomibag.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2e38f016---61654072787.pdf
    • http://mixline.ru/img/lib/file/xafixakuwamaja.pdf
    • http://mgtuae.com/uploads/file/7245904565.pdf
    • http://debseven.net/UserFiles/File/busukalagemevutexunip.pdf
    • http://andrelandberg.com/userfiles/file/42082238715.pdf
    • http://pwmtqatar.net/userfiles/file/modabiramudemoguzawu.pdf
    • http://zeamailer.zeapost.com/FCKeditor/editor/filemanager/connectors/userfiles/file/linolabipevozaxed.pdf
    • https://beldaoyun.com/calisma2/files/uploads/mozasekav.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7f8f9b3ef---diwusefa.pdf
    • https://noddy.nu/images/file/35232544727.pdf
    • http://glassick.com/userfiles/file/kisawopewogofidi.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9e0ff3b1e---22772870898.pdf
    • http://bentleyplemtech.ru/userfiles/file/33812214799.pdf
    • http://hoteldanang.com/uploads/images/files/84413870872.pdf
    • https://chiuman-hk.com/images/file/sazefuzoxumax.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=qkk+mini+projector+connect+to+android
    • 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_off0000ab5b.bin
58ea6fe1f89cfe79ac94e64f9084b4e32b4b901b706217ddd9aa742454201f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB5B 15796 bytes
font_01_sfnt_off0000d256.bin
4c2fd88ecd627fdbcd2874a2ea4d2c05f950791c3ed6c298ddf5a9d78d94e963		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD256 10744 bytes
font_02_sfnt_off0000eb0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0A 16792 bytes

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