Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef377c840192fd41…

MALICIOUS

PDF

89.9 KB Created: 2021-06-30 03:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e438e2e951e431a33132852fa4a501e SHA-1: 577dac63fccfe8cf43ef8ddcb6f7984c5b7c61d7 SHA-256: ef377c840192fd4126e02494474c171f2c945c757767be2ecf7618f9db737c7b
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to WordPress sites utilizing form upload plugins, suggesting a link farm or distribution point for malicious content. The presence of these links indicates an attempt to redirect users to potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bt58q03ic95c2pta2b5g32p61g/25100741580.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/41a63b3c794daccbdbc5e06ebd1bfe17/zexipewavololufexoni.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec0eefa8e---95535239836.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/95777ff1d3d0820e09e323163dc929a0/nopukakemipufogujem.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160846a67618a0---58062997455.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091705179492---15547992964.pdf
    • http://alfavit.tv/userfiles/file/dodobojulabigikefisawan.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d54099ee1---tagebegajedikinenoseguzer.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec33d881ca---75551598562.pdf
    • http://monkey-do.net/userfiles/file/18114722250.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1011617c---40425904259.pdf
    • http://investin-khj.ir/ckfinder/userfiles/files/peririzagagexaxisakexose.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e471a556e---selizasu.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/cj2qv2k3ptgs6g9jmvq25ovne7/nepipisopofusawigaru.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/sirudasokigu.pdf
    • http://usmleworkout.com/files/file/vibisudoginiwavu.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608092c97b680---dagivovijuxelevotex.pdf
    • http://grafichesirio.com/userfiles/files/36684304978.pdf
    • https://parfumzone.ro/files/file/82133925914.pdf
    • http://rasmesafar.net/basefile/basefiles/radetewevipote.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b929470ccc---bogenizuf.pdf
    • https://aquafilling.com/userfiles/file/dajikifurususejofaxexu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80286dcf06---12840734991.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762944285f6---38031285861.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+compress+pdf+file+size+below+200kb
    • 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_off0000fbd9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 16792 bytes
font_01_sfnt_off000113f0.bin
388db4f8e32be643febe50e8545bf07aeb774935452b96238e3ae6636f414653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 11124 bytes
font_02_sfnt_off00012dc4.bin
00beeb20057eca9643374e7601d49e8ca2d9daa332d5998aab2a727a6de0364c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC4 17144 bytes

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