Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f05b3f6cfb22be…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 14:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5e4c95f48520802752c52ac76206d45 SHA-1: d1ff9cc07360fccfb0d3b54a3a12571e88eeb800 SHA-256: 88f05b3f6cfb22bed53cde482960f524b6b64539156d99df881261a142d72807
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links likely serve as redirects to phishing pages or malware download sites.

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 https://kede.org/userfiles/file/8344723882.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/4dbe5e89d326019f3096947e6dc66005/voxilaguxakogufenosaf.pdf
    • https://hmanagement.net/userfiles/file/61591408492.pdf
    • https://pharma-tools.eu/galeria/file/setoletobuvovalezukumeme.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7r5mg7dopuuv351bgh9rj7c6aa/tiladesudemesevupem.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7af1fd7e---57787695994.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160963309cafe3---buwub.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16096187230853---75812114438.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210617184906.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4c5d50ce19132e5ff77635fd303708e0/febapejoziko.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeaeda3209---gumos.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/god9fre5rl5qq95sjefuac28bd/segofizebigefabafu.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/anlet6qvclq48483jsa8onvam6/gumanuzetoxalebijiwutobus.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdeaf22ced---sixagebadiziragiwo.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/b73c84e1130f7cac3268fd3cc01108ef/87955218921.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7196bacd1---dezoza.pdf
    • http://sfera-vlad.ru/img/file/gukobej.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/80963777730.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b45706be473---51703513337.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7811b49a7---birezofelakurexi.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/12b0eebeab67890b2a3fcef94ce27e79/dogufofeboxoxudul.pdf
    • https://rieker-consulting.eu/files/file/vafatumupebotozeje.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1650a3d26---82476921362.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/dawesof.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b60a0d72009---gesubepuwezil.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fine+particles+examples
    • 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_off0000f615.bin
a15f22fd6ef40a0aa790078195ba35cfe90f4d09a41672cfe678cd32087e1e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF615 17084 bytes
font_01_sfnt_off0001224c.bin
d4319a8e97bf6215c59144bef5955b106b79e006caad57ec6da2185c7fa9642a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 10492 bytes
font_02_sfnt_off00013a27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A27 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.