Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a21dc25f4ececf6…

MALICIOUS

PDF

90.1 KB Created: 2021-07-09 01:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 237e70a770fb210a253f48990f05e231 SHA-1: bbf43c8298798f2d540a60ae7e3aa72b8ec6a307 SHA-256: 2a21dc25f4ececf6c530e664970fa94f457130ae06397812a0837743a2832042
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://handsonmontessoripk.com/userfiles/files/44891003943.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a6fe46ed4f596a6e2d88521bf9ac945c/mugelikimofixozedojo.pdf
    • http://architettoseneca.com/userfiles/files/97190842569.pdf
    • http://poltinik.ru/userfiles/file/61867776575.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/795eafb879a1e473359824b96967724d/toviwovigabiroxijarenor.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160845eec68e60---legiv.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/8ea8a8618ea89558ebc2280f7d947494/vilefimupaver.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/nq812oid0fs0rf6jkr0bpiq7lv/58275629976.pdf
    • http://lab4050.com/upload/editor/file/26430973326.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789097bc12d---79265802791.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0158dd4c3db29cfc9b2e9f87004a24d6/besexidotasudazekofutoki.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/b9c95a87863a2c55dd98bf168263b930/ripumekevirapadunapovix.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607a6429e2c40---19743661401.pdf
    • http://bkmjg.com/images/upload/File/rukugajopawenakupesesi.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d407807f7---19756920444.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/j1mv99h264nasmrsl527cdqul2/jokisomu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ae859d92a---48685788089.pdf
    • http://jandebruijn.com/uploadimages/files/woxatofo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbf453323---15460968423.pdf
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021061104511880554.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5c9231b386a7dab750262e5a558d7eec/rijepivopa.pdf
    • http://agendatourvietnam.com/hinhanh/file/25058605818.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3b086ed61---kugifidozituvalufolu.pdf
    • https://publicbridge.pl/userfiles/file/fudegadagis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=price+of+first+class+stamp+2020
    • 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_off0000fb47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
font_01_sfnt_off00011359.bin
f6fa2e4662713c37a0e0ec7737ce3a6cf23074e96727eb0907a257bf95c0c841		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 17728 bytes
font_02_sfnt_off0001421e.bin
328ffde92bf5ca52fa589459f647d2f4623be434e0ec838011460f179a34a75e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 10780 bytes

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