Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcdf683b7e2dead…

MALICIOUS

PDF

79.0 KB Created: 2021-06-29 01:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ac6d3d7e39af227bc12a51302d5fa0f SHA-1: 26da5465b14bb41985fa2d8ba4ec80d83974646a SHA-256: cdcdf683b7e2dead1dbb7a1db42f596ad8ceb8ef4f3c1418149298a9f8c93f33
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of numerous distinct hosts and the use of UTM parameters in some URLs indicate a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/akjt71s67bigmk0etjefpdoobm/12749056510.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fafbb8bc9c7abb9a150079ac9c3120e6/45537207832.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b591e0cad9f---53143209471.pdf
    • http://agendaalzheimer.org/files/galeria/files/12631724399.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb0667bba---nojepomazusimagelimulin.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083f47f03a27---58717049328.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b0ddc8c5---tikimeri.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adac4117c3e---18903481302.pdf
    • http://caopump.com/admin/userfiles/file/16220403292.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6a6905d98---pozaru.pdf
    • http://zdrowejaja.com/Upload/file/timex.pdf
    • https://a2designbg.com/userfiles/file/16980398705.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tr57o701u8honlmh6lja3vjh5u/76658496329.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786e9165fc9---82734143741.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079255552980---fubizasovexumawabanut.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/867d1be95c61539fa48f5dd40f73f754/gival.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e26039cbf11a3fbac747c79e585c916e/jelinadevi.pdf
    • http://www.deco-interieure.com/userfiles/file/favonivokolejulilof.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9354e9b5a0---42122623207.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c0441e4d---debavoribugis.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d882ee820f8---93548068093.pdf
    • https://eprobatdz.com/ckfinder/userfiles/files/jetoxidegixabigusokag.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/xekakaluvuvufubumikopos.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada42a99c3---12133939796.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824d9b0b953---majameravak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=bank+valuation+and+value+based+management+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_off0000d05f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD05F 16792 bytes
font_01_sfnt_off0000e876.bin
dacc0a04c9cdd0f0ac6d3a51be985eb264981efbbe5afa4028872d8364899915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 11192 bytes
font_02_sfnt_off00010240.bin
01bf021115cd13a19f85687b2323fc5db28aec66d28457fafb1c153b9451c468		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 17088 bytes

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